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Slow Leak in Fuel Tank


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#1 ARozanski

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Posted 27 March 2015 - 03:59 PM

Started this summer, very slow leak from front of tank, not the petcock or crossover tube. Scraped it down, no hole. Assume it is in the seam weld for the front mount bracket, left side.

Any suggestions on sealing it? The inside has been ''çreamed'' previously, not by me so I don't know what was used. Can it be done again? I am reluctant to just spread JB or something similar on the outside, as I want to fix this permanently. I guess it could be re-welded, but I can't even see where it might be leaking from exactly.

Maybe I will re-fill and see if I can see it come out.

Tony
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#2 guzzidude

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Posted 30 March 2015 - 07:42 AM

I would use MEK to get all the Kreem out, then try to hunt down the leak or leaks. I've used KBS sealer after I used the electrolysis method, but would do the Ospho if I did it again in case I wanted dual petcocks down the road. Sallen used silver solder on his tank. Maybe this for holes then Ospho.
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#3 ARozanski

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Posted 30 March 2015 - 04:56 PM

Well, I am trying the two part epoxy gas tank sealer from Permatex. I found an extremely small hole behind the front mounting tab, not sure if it is rust, or a crack. It wouldn't leak yesterday before I started digging at it, so I think it must be temperature dependant (warmer, metal expands, hole opens up a bit). Anyway, scrubbed it down thoroughly, sprayed it out with acetone, sanded it down, applied the epoxy around the bracket area and worked it in as tight as I could. After it sets up I will fill the tank and see if it leaks. If so, I will remove the epoxy and just get it welded.
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#4 guzzidude

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Posted 30 March 2015 - 05:54 PM

Sounds good.
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#5 lobofuego

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Posted 04 April 2015 - 07:55 AM

Fill the tank with water, tip to appropriate angle, and braze it!!




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