SOHC.co.uk Forums > CB500/550

pin hole in fuel tank

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neat street:
Hi All, after a good and succesful clean of the tank on my CB500, I have found a couple of pin holes..... The question is, would you mig weld them, braze, or use lead solder like they used to do on filling body pannels instead of filler years ago? these must have been there for a while as the PO had used some kind on filler on the outside which `done the job`. I dont realy like the idea of using a tank seal as many have had issues with this in the past. I will prsure test the tank to find all leaks :-)

Johnwebley:
If they are small, use solder

Can't think of any downside



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McCabe-Thiele (Ted):
I had a pin hole leak on my Yamaha tank, I tried a tank seal product, that lasted less than a week.
I ended up fitting a new tank.
When I pressed along the underside of the pinholes it was rotted out everywhere.
Clearly it is dangerous to use heat as there is a risk from residual petrol vapour.

I have been told that older bikes have thicker metal, the pin hole is the tip of the Iceberg imho.

ozzybud:
If you have 2 pin holes you have dozens ready to break through.. A proper application of an Epoxy liner will last for years. The prepping of the tank before application is key. It needs to be free of loose rust and oil or grease.I use acetone as a final rinse. I use a 2 part kit from caswell.

https://paulyaffeoriginals.com/products/caswell-epoxy-tank-liner-kit-clear

Jond99:
I’ve used POR15 in the past with great success, as above preparation is key. Even though you’ve already cleaned it I would do the process again to ensure you move any rust that may have developed.

I had some POR leftover in the tin and when it’s gone off it’s absolutely rock solid.

For the de rusting process used Flowliner Bio rust instead of the one in POR15’s system.

POR does seal pin holes but depending on where the hole is if needed you could add a bit of structure to held the liner seal with something like JB Weld tankweld. It’s function in this senario is purely to contain the liner whilst it goes off.

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