winged petrol cap

[frogeye1000]

just a quick question,  do the winged fuel caps have a rubber or cork seal. i have an indian tank and cap, but can't see how it would seal without one.

cheers

Richard.

[muskrat]

G'day frogy.
I can't imagine it would work (seal) without one. Over the years I've made my own out of 1/16" rubber or cork. The cork worked best but only lasted a few years before a new one was needed.
Is your cap hinged?
https://www.britishmotorcycle.com.au/store/bsa/fuel-tank-cap-alloy-wing-nut/
https://www.classicbikespares.com.au/product/petrol-cap-seal-2-1-2-flip-up/

[limeyrob]

Cork. Don't try making a rubber one, I did and it swole up and jammed the cap solid.
Cork seals for std caps are cheap and may fit, If not I think the OD is OK but the ID may need trimming.

[Rex]

Funnily enough I made a cork one for my pre-war Red Hunter and the cork crinkled up in a week. Someone recommended some sort of synthetic rubber sheet off Ebay and it's still going strong.
Modern juice seems to attack some stuff and not others.

[MikPowl]

Search:  Fuel Proof Rubber Sheet  in Ebay -  plenty of stuff of various thicknessses to choose from

[limeyrob]

Makes sense, i think I used the rubber that was not ethanol proof.  So only get the new stuff.

[frogeye1000]

thanks for replies. i have some sheet cork, and neoprene. i'll have a go at making one. Seems most of the ones on ebay appear not to have a seal in them.

rich.