charlie chitlins Posted August 16, 2013 Share Posted August 16, 2013 No luck solving this so far. Probably fuel (ethanol) related. The plastic is way indented between the threaded inserts. Thicker o-ring didn't help. Any ideas? Quote Link to comment Share on other sites More sharing options...
thats_a_five Posted August 16, 2013 Share Posted August 16, 2013 If it is ethanol swelling, you can drain the tank and let it dry out for a few days. Swelling will usually shrink back to size. I have stopped using ethanol fuel in my bikes. Quote Link to comment Share on other sites More sharing options...
copemech Posted August 17, 2013 Share Posted August 17, 2013 As I recall, older shercos came with a gasket on the petcock. Might try combining the two to get a good seal if you can find the gasket. Other thoughts include trying a good RTV sealer like three-bond. I think it is fuel resistant, however it is not alcohol resistant, so must cut the alcohol out of the fuel. I do not know if it is possible to find or make a thicker seal ring of square profile that may work. Quote Link to comment Share on other sites More sharing options...
charlie chitlins Posted August 18, 2013 Author Share Posted August 18, 2013 I'm using no alcohol fuel (100 oct avgas). But, Copeski...you're the 2nd one to mention a square section seal...the first being a hydraulics guy who spends a lot of time dealing with seals. So far my best fix is a carefully-sliced bit of 5/16" fuel line. Seems to be holding... Quote Link to comment Share on other sites More sharing options...
asbo239 Posted September 1, 2013 Share Posted September 1, 2013 I've had the same problem with a 2006 125 so I used a rubber grommet to seal it but then found out it is leaking from one of the treads in the tank as well!! I'm going to attempt to remove the threads and manufacture a plate to go inside the tank for the petcock to bolt to. Plus a little bit of that sealer copemech suggested! Quote Link to comment Share on other sites More sharing options...
charlie chitlins Posted September 2, 2013 Author Share Posted September 2, 2013 Not sure what keeps those inserts in there. I wonder if the tank is molded around them... Ryan would probably know. Quote Link to comment Share on other sites More sharing options...
asbo239 Posted September 2, 2013 Share Posted September 2, 2013 Lol the tank USED to be moulded around the screw inserts in mine but over time it has cracked around one of them so I have removed it completely ready for a plate inside instead. Hope it works as there's no going back now! Quote Link to comment Share on other sites More sharing options...
charlie chitlins Posted September 3, 2013 Author Share Posted September 3, 2013 There is a putty made by one of the well-known companies (Loctite?) that is for sealing fuel tanks. Probably your best bet for keeping the plate sealed. I used some to fix a fiberglass tank and it's been holding. Quote Link to comment Share on other sites More sharing options...
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