Hi all,

My 1984 K100 has been up and running for a month or more now - after finally getting it registered in the UK. It's running well, but there is a small leak from the fuel tank (front bottom left-hand side before the lower seam).

This is a leak that had been repaired before.

Should I repair this from inside or out?

What is the best method/material for the job?

Will post some pics - there's an odd fairing on my bike! Wonder if anyone else has one.

Best,
Neal

Hey Neal, Hi!

My 88 was repaired with JB weld on both sides when I bought it. It looked to have been on there a long time, since it had been painted over. I replaced my tank but who know how long it would have lasted... A good welder can fix it easily with a TIG machine also, once it's cleaned out. I don't know about sealing the inside. Maybe someone else can say how that works.

Luck!
Steve

Hi Neal,
There are two ways to fix this, internally and externally. The internal fix uses a resin which coats the whole tank interior and works really well. My pal's Suzuki Intruder tank rusted out and had a big hole. A patch was fitted and brazed in and the tank treated and is now perfect again plus protected from further problems. My K bike tank had a small spot where it was getting damp with petrol and I used Permatex kneadable petrol tank sealer. I took the tank off, cleaned the area and with the tank positioned so there was no pressure pressed a blob into place firmly. It sets very hard and has not leaked at all since. I know several people who have used that and a similar Loctite product.
Regards,
K-BIKE

Great thank you!
Neal

Hi neal

Just discovered I had a 3mm hole in the tank immediately underneath where the fuel pump sits just inside the seam. After reading this thread and others on flyingbrick website and general google search on various products available went with the Permatex GTR 1 Gas Tank and Radiator Repair kit. $8. Only used 10mm piece off the roll. They claim it sets hard within 5 minutes and can be drilled machined etc in 2 hrs is pretty accurate too as it set hard as a rock. The Full cure time indicated is 24hrs and unlike some of the other products claimed suitable it is impervious to fuel deisel oils detergents etc. not merely resistant.