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1Back to top Go down   Testing In Tank Fuel Sender Unit Empty Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 10:52 am

jimz49

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Can someone provide me with the ohm range of the in tank sending unit? I checked mine and it reads from 110 down to about 85 through about half of the float arm movement and at that point it loses continuity all together. My guess is it is faulty and should read all the way down to 0 and never lose continuity. The fuel gauge has always read from full to about 3/4 tank and despite bending the float arm the range never changes.

    

2Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 11:35 am

charlie99

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from memory jimz i think it goes down to 30 odd ohms .

you may be able to remove the sender (after undoing the fuel pump as well, as the wiring is more or less fixed to the sender unit base )

i have a feeling that it is more or less resembles a wire wound potentiometer . possibly the windings have gathered at one end ? or the wiper has become distorted .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

3Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 2:41 pm

jimz49

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So, the ohm reading should be from approximately 110 down to 30? I had the sending unit out of the tank and there were no obvious problems with the windings. Regarding the wiper: there are actually two wipers. One sweeps across the windings and the other across a plain plate under the windings. The odd thing is the plain plate has a plastic insert of some type about mid-point of the sweep and that is where the ohm reading loses continuity. There are two green wires that provide the reading from the windings. One green wire is attached to the end of the windings and the other green wire is attached to the plain plate.

    

4Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 3:50 pm

charlie99

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hmm sounds like the insert shouldnt be there at all ....unless at one time it used to house a track of some kind , is there a noticeable difference in height between the plate and the insulating section ? what im asking is is there a continuity of the plate if the insulatng section was removed ? or is there a chance that there were fingers of the wiper either side of the insulator once apon a time ?

i havent actually pulled one out of the bmw before ....but i guess after seeing similar units many times, they shouldnt be much different erm in theory .

hopefully someone has a detailed pic of a good one somewhere


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

5Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 6:12 pm

jimz49

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Actually, the plastic insert is flush with the surrounding metal. Seems it was intended to be there, I'm just not sure why. I put the sending unit back into the tank, otherwise I would take a picture of it.

    

6Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Mar 12, 2012 9:38 pm

Inge K.

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According to information I have, the resistance should be from 3,4 to 110 ohms.
Haven`t done any test to verify this....one day with plenty of time, and nothing to do.

Here is a picture of one that have seen better days and is pryed open.

Testing In Tank Fuel Sender Unit Img_0010

Inge K.

    

7Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 1:10 am

charlie99

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inge ....you dont have a pic of the sweeper arm ? i'm looking to see if it has more than one finger for the common contact ...or in fact, if the pivot arm is one of the contacts itself (pivot point being the common contact other wise ) it would be just good to know i guess ..


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

8Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 1:26 am

jimz49

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You can see in Inge's picture that the one plate has a round plastic (red) insert. Notice the arch shaped line on that plate. Although shorter, it's similar to the arch line on the windings. To answer the question regarding the contact arms (sweepers), there are two sweepers attached to float arm. One arm sweeps over the windings and the other sweeps over the plate with the round plastic insert. The varying resistance is sent back to the cable via the two blue (actually green) wires that are soldered to the orange plug. I took my resistance measurements at the solder points while moving the float arm through it's full range.

    

9Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 1:46 am

charlie99

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ah! so the body sweeper is more a constant distance/ stabilizer for the second or active sweeper / across the resistive element ...the pivot being the main constant contact point ?

that explains a lot

jimz the only thing i can think of is... that at some point the sweeper contact across the resistor may have become distorted ...and now not making "good"contact with the resistor body as it sweeps its full movement ...maybe the pivot pin has been bent or something ? (possibly durring an attempted adjustment ) maybe you could clean up the contact windings on the lower half of the resistor with a bit of thinners or something ...there maybe some form of coating ---corrosion across that part, from the now low tension ?

the resistor looks to have a rising rate or angle associated with its length so the sweeper makes more presure on the resistor element as it moves across its length ....could the sweeper arm lost some of its tension ....and now not contacting the whole resistor .

the resitance values seem correct so it sounds like a non contact type issue to me

just some thoughts that may help

    

10Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 10:10 am

jimz49

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I thought possibly the sweep arms were not making good contact when I first took the cover off the sending unit body. I brightened up both contact areas with some fine steelwool and bent the sweep arms so they would provide a more forceful contact. Unfortunately, neither effort changed the outcome.

The resistor does not rise in rate of angle. It is flat across the body of the sending unit.

At this point maybe I should start looking for a replacement sending unit. Hate to approach a problem by switching out parts, but I'm not sure where to go from here.

    

11Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 11:48 am

charlie99

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maybe the pivot is bent after all ....worth another look jimz


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

12Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 3:45 pm

greecek100rt

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can you measure the dimensions of the O ring??? (internal diameterX thickness in mm)

thank you

    

13Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 9:29 pm

Inge K.

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jimz49 wrote: I took my resistance measurements at the solder points while moving the float arm through it's full range.
Measure between the yellow wire and ground (brown), the plate with the red dot is
for the warning lamp and have nothing to do with the gauge.
The plate for the warning lamp can be adjusted if you wish to (while/if you still have things apart) look for a toothed segment at the bottom.

Inge K.

    

14Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 9:54 pm

Rick G

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Inge K. wrote:
jimz49 wrote: I took my resistance measurements at the solder points while moving the float arm through it's full range.
Measure between the yellow wire and ground (brown), the plate with the red dot is
for the warning lamp and have nothing to do with the gauge.
The plate for the warning lamp can be adjusted if you wish to (while/if you still have things apart) look for a toothed segment at the bottom.

Inge K.
Oh Inge you spoil all my fun I was waiting to find out how long it would be before someone worked it out about the plastic bit.
I know its mean and horrible but it is fun lol! Testing In Tank Fuel Sender Unit 652573


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

15Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 9:58 pm

charlie99

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Testing In Tank Fuel Sender Unit 44271


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

16Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 10:32 pm

jimz49

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Don't have it apart right now, I've moved on to a slipping clutch issue. Glad someone cleared the air on the plastic bit, couldn't figure out why it would be there. Thanks to Inge for that one. Testing In Tank Fuel Sender Unit 112350

    

17Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 10:39 pm

Inge K.

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Rick G wrote:Oh Inge you spoil all my fun
Sorry to ruin your day, Rick........I add on another 24 hours next time.

Inge K.

    

18Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Mar 13, 2012 10:56 pm

Rick G

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Testing In Tank Fuel Sender Unit 44271


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

19Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Wed Mar 14, 2012 2:32 pm

jimz49

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Okay, got a chance to check the sending unit today and this time got the correct resistance (3-108). Since it isn't the sending unit that's amiss, where should I look now? I have the fuel gauge off the bike. Can I do a bench test of the gauge using the sending unit?

    

20Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Wed Mar 14, 2012 2:48 pm

charlie99

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yep shouldnt be a problem jims just need 12 and ground ...tie the guage earth to the meter earth and the output of the guage to the meter ...+ the 12 volts on the right terminal of the guage

9 = fuel guage sender

10 = guage

Testing In Tank Fuel Sender Unit Esquem11

by the way ...have you checked the 4 pin tank connector plug under the right hand side cover ...the socket part tends to expand around the pins of the plug and intermittent-corroded connections result ...often a sqeeze of the sockets restores good connections

    

21Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:12 pm

jimz49

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Did the bench test today on the fuel gauge. The gauge reads from about 3/4 full to sightly past full as I move the float arm through it's range. Is this normal for the gauge to fail in this way?

    

22Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:25 pm

charlie99

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verry odd jims .....what happens when you add a 150 ohm resistor in circuit to earth and the sensor input of the guage ?

kinda sounds like the shunt resistor has changed value ?

you could measure accross the b+ of the guage and the sensor input and see the value (unfortunatly i dont have mine out at the moment for a comparison )


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

23Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:35 pm

Inge K.

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Don`t help you much, but mine also have a rather strange behaviour.

Start from full...as normal down to half....then moves up again to 3/4.....
and then stays there untill the tank is empty.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

24Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:38 pm

Inge K.

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charlie99 wrote:you could measure accross the b+ of the guage and the sensor input and see the value (unfortunatly i dont have mine out at the moment for a comparison )
This value should be 125 ohms.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

25Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:42 pm

charlie99

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might be just as easy to measure the movement of the sender jimz ....just put your meter across the earthy side of the sender unit and the send wire .....you should get a nice sweep from 3 to 110 ohms ......if not you have found the little critter .... check that there is good presure across the wiper as it moves across the windings ..you may have to clean up the wiper contacts with some really fine wet and dry soaked in with wd40 or rp7....only problem with that is that it could leave some grit in the surface ....but paper used after might release it

just some thoughts

just saw the value inge ...thanks


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

26Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:49 pm

jimz49

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The reading went straight to full, which is odd. According to my resistance readings of the sending unit, empty is the higher resistance. So adding resistance should have made the gauge swing closer to empty.

    

27Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 7:59 pm

jimz49

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If you are saying to measure the resistance between the yellow and green wires at the back of the meter, then I'm getting a reading of 221ohms.

    

28Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 8:09 pm

charlie99

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wow almost twice as much as i expected ....sounds like some thing bad has happened inside to me

opening the meter has its issues .....like trying to reassemble it ....the hard bit is getting the glass face and surround clipped around the circumference of the meter body ....not an impossible thing ...but awkward for me with shakey hands


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

29Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 8:20 pm

Inge K.

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charlie99 wrote:...but awkward for me with shakey hands
I always thought this was a Monday morning problem....it`s still Friday......Hooray Testing In Tank Fuel Sender Unit 502531


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

30Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Fri Mar 16, 2012 8:34 pm

charlie99

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jimz i went inside one of the meters a little while ago ....you might gleem some ijnformation in this thread

http://k100rt.aforumfree.com/t2977-anyone-succesfully-been-inside-a-temp-guage


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

31Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Sat Sep 14, 2013 7:04 pm

robmack

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UPDATE:  

Created a complete How-to posting in the How To section of the site.  It includes all the original material plus a description on how to change the sender to be compatible with modern gauges.



Last edited by robmack on Sun Dec 28, 2014 5:41 pm; edited 9 times in total


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

32Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Sat Sep 14, 2013 8:45 pm

Rick G

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Job well done Rob we shall have to get Bert to place that in the downloads section.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

33Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Sat Sep 14, 2013 9:32 pm

charlie99

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great write up rob

did I see somewhere that inge said that the block for the reserve could be moved somehow ? I didn't see how it could be done


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

34Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Sep 17, 2013 10:48 pm

K75cster

K75cster
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In Robs excellent post above he shows the left side contact pic supplies ground to the reserve light and the right side contact pic is nonconductive because its when the fuel is either full or heading down to the near empty point where the light comes on and the sweeper on the windings is only for a gauge if one is connected??? is that correct????


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

35Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Sep 17, 2013 11:08 pm

robmack

robmack
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Yes, that is absolutely correct, K75cster.  This conclusion is also substantiated if you examine the K100 schematic diagram.  The four wires from the tank connector are:

Green/White = +12V for pump (pin 15)
Brown = Ground (pin 31)
White = Low fuel indicator (pin W)
Yellow = Fuel level (pin G)

Green/White comes from Fuse 6; ground from the frame connection under the tank.
The white wire goes to pin 7 on the instrument panel.  It is the low fuel indicator function.
The yellow wire goes to the "Connector for Additional Instruments", an Amp 4-way female connector under the right side of the tank.  This is the connector that is used on an RT or LT to connect up the Gas Gauge.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

36Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Wed Sep 18, 2013 7:13 am

CO1637P

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This post I liked. Thank you


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Testing In Tank Fuel Sender Unit Thump_10
    

37Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Wed Sep 18, 2013 8:25 am

japuentes

japuentes
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Now I think I can fix mine.
Thanks


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Testing In Tank Fuel Sender Unit 2854237993 1988 K100RS SE/ABS
    

38Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Wed Sep 18, 2013 9:49 am

robmack

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charlie99 wrote:great write up rob

did I see somewhere that inge said that the block for the reserve could be moved somehow ? I didn't see how it could be done
Charlie, you're absolutely right and I totally missed Inge's comment earlier in this thread.  Thanks for pointing this out.

I've found the toothed wheel about which he spoke and I've updated my description to include this adjustment.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

39Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Feb 10, 2014 8:01 pm

orforester

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Any help on the 85 style fuel sender unit?


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89 K 100 RS se
85 K 100 RT
    

40Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Feb 11, 2014 4:04 am

Inge K.

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Some info you find in this old thread.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

41Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Apr 28, 2014 6:33 pm

billtr96sn

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Thank's very much for this, but can you clarify something for me.

I am using a car fuel gauge and looking at your wiring, I only need to attach the yellow wireto one side of the gauge and the brown to the other (without worrying about the light)


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Something witty is supposed to go here... help!! Testing In Tank Fuel Sender Unit Uk-log10
http://www.billsbikechat.co.uk
    

42Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Mon Apr 28, 2014 9:32 pm

robmack

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You should tap off the Additional Instruments connector  for your automotive fuel gauge.  This connector provides all the signals you'll need for your gauge -- ground, +12V, sender and parking lights.  I don't know your type of gauge, but normally one side of the gauge is to +12V and the other to the sender.

Be aware that the BMW sender works opposite to modern fuel senders.  Your gauge may respond falsely, indicating empty when the tank is full.  Hopefully it can be adjusted to compensate.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

43Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 6:05 am

billtr96sn

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I have looked for the additional instruments connector, but I don't appear to have one. This mat  be down to being a ex police bike


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Something witty is supposed to go here... help!! Testing In Tank Fuel Sender Unit Uk-log10
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44Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 6:38 am

Rick G

Rick G
admin
admin
Sometimes with the police bikes they are treated very badly when they are stripped of the police gear and it can be a cut and tape festival.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

45Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 7:09 am

Crazy Frog

Crazy Frog
admin
admin
RicK G wrote:Job well done Rob we shall have to get Bert to place that in the downloads section.
Yes very well done Rob.  Testing In Tank Fuel Sender Unit 112350 


I placed your posting (with a link to this thread) in the downloads section. (It's under Electrical -> Fuel sender units) It will be easier for people to retrieve it when needed.

Bert


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Testing In Tank Fuel Sender Unit Frog15Testing In Tank Fuel Sender Unit Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

46Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 8:30 am

robmack

robmack
Life time member
Life time member
Testing In Tank Fuel Sender Unit 010anno

You're looking for something like this on the right side under the tank.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

47Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 10:37 am

duck

duck
Life time member
Life time member
Testing In Tank Fuel Sender Unit Auxgau10


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

48Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 2:42 pm

billtr96sn

billtr96sn
Silver member
Silver member
Nope, definitely not.

In the relay box I found this which has most of the right colours

Testing In Tank Fuel Sender Unit CAM00156

Testing In Tank Fuel Sender Unit Bmwwiring

Testing In Tank Fuel Sender Unit Bmwwiring2


But nothing like I 'should' have on the right under the tank

Testing In Tank Fuel Sender Unit CAM00159


__________________________________________________
Something witty is supposed to go here... help!! Testing In Tank Fuel Sender Unit Uk-log10
http://www.billsbikechat.co.uk
    

49Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 4:12 pm

robmack

robmack
Life time member
Life time member
What you have ahold of in the first few pictures is the Connector for Special Equipment.  
Testing In Tank Fuel Sender Unit Special%2520equipment%2520connector
It's not a useful connector for your gauges.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

50Back to top Go down   Testing In Tank Fuel Sender Unit Empty Re: Testing In Tank Fuel Sender Unit Tue Apr 29, 2014 4:30 pm

duck

duck
Life time member
Life time member
if your bike didn't come with gauges from the factory then it's probably taped off to the clump of wires and not hanging out in the open.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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