Newb with a B&S generator engine

Is it seeping out of the cap threads or is it migrating over from the carb to tank gasket which is also a know leak location.
 
If the fuel is leaking out the holes in the top of the cap, the gasket is not sealing. If it is leaking around the base of the cap, the cap is bad or the threads on the filler neck are bad.
 
Bought a new cap, made zero difference. Filler cap threads are not damaged, and the new cap gasket has a nice ring where the lip is sealing. Just seems to be that fuel splashes up, gets through the air holes, seeps around the edges, and oozes out from between the threads. As a test, I tried wrapping the threads with electrical tape. On the plus side, it stopped leaking. On the downside, the gas dissolved the tape and made a black, gooey mess. I can confirm that if I make a gasket without any holes in it, it seals fine and doesn't leak, except the engine stalls eventually because the suction builds up in the tank.

Any ideas? Almost seems like I was on the right track with the electrical tape. Maybe I need to find something equivalent to teflon tape that is fuel proof and wrap the filler neck.
 
Get a fuel rated O-ring at the hardware store. Install around the threads. Or 5 of them if it takes that many to seal. Think those are 1.5" fuel caps. Lube the rings with silicone plumbers grease.
 
Fixed it. Got some of this stuff, trimmed the width down a little, wrapped a turn around the tank neck, and no more leaks. Cap makes a snug fit, but no gas oozing out on to the tank.

Wrapit Silicone Tape | Permatex®

Self-fusing silicone tape forms a permanent airtight seal. Insulates, waterproofs, and reinforces.
www.permatex.com www.permatex.com
 
Did you guys see that package? Says it replaces DUCT TAPE and electrical tape. THAT is a bold statement. LOL

So now is that silly-cone tape really fuel rated? Says it is on the package.

Nice find on the tape. I have a McLane edger that needs some of this. Gas tank no longer made....

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