Small fuel leak under gas tank - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 14 (permalink) Old 02-20-2015, 03:06 PM Thread Starter
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Small fuel leak under gas tank

Its a SP1. I just replaced my exhaust and while I was doing it I noticed a small fuel build up by on the under side of the tank(rear) next to the bracket that bolts to the frame. Not sure if I have a bad weld there from factory or if it's a leaky line. Any Ideas if this is common or what to check? Thanks guys.
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post #2 of 14 (permalink) Old 02-20-2015, 03:26 PM Thread Starter
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Damn, just googled it..... looks like it happens to a lot. I will remove the tank and JB weld it. If that doesnt work I will have to Clean it all out with soap and water. Let it air out and weld it......
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post #3 of 14 (permalink) Old 02-20-2015, 03:44 PM
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Safely weld it.
Don't trust JB Weld on a safety related item.
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post #4 of 14 (permalink) Old 02-20-2015, 03:48 PM Thread Starter
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yeah I agree......
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post #5 of 14 (permalink) Old 02-20-2015, 08:29 PM
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Saw this thread and almost glanced over it, but I thought what if it was my tank, So you weld it and then you have the instant rust on the inside you have to treat somehow. I might strongly consider depending on the accessability using some prc or something similar that they use to seal wet wings in small airplanes. All the metal seams have this spread over them for sealing the 50 or 60 gallons the tanks hold.Or both welding and sealer. Aircraft Spruce and supply-all kinds of good stuff there.
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post #6 of 14 (permalink) Old 02-20-2015, 11:44 PM
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I think I have the same issue. House started smelling of fuel. Small puddle under the RC51. I put it on a rear stand, and it slowed down a little. Out of town this weekend. Will have to wait until mid week or later to fix.
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post #7 of 14 (permalink) Old 03-07-2015, 08:46 PM
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Yep. Fuel tank leak at the bracket attachment area. It's been jb weld repaired before. Looks like no Prep. The repairman just globbed jb weld right on the crack. I was able to scrape it off in the leak area with a screw driver.

Looks like with a little prep work, a jb weld repair will work. I think the 50/50 nature is due to prep. If it doesn't work, I'll weld and red kote.
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post #8 of 14 (permalink) Old 03-08-2015, 05:45 AM
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I had it welded along the black line. Also weld shut the grooves (circled)



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post #9 of 14 (permalink) Old 03-08-2015, 06:10 PM
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Not the best of ideas to JB weld a fuel tank right under your balls; do it right and get it welded properly, it's just not worth the risk of a bodge repair on a fuel tank.
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post #10 of 14 (permalink) Old 03-09-2015, 07:31 PM
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My SP-1 had this problem. I asked my friendly parts manager at the local Honda dealer about it and he had heard a while back that Honda sometimes replaces the tanks for free. Sure enough, he spoke with the regional Honda rep and they ordered me up a new tank! Of course YMMV.
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