Seal for Gas Cap

[Counter]

My gas cap on my '81 GS850GX is leaking. I took a good look at it and the rubber seal looks like crap. I also had gas coming out of the top of the cap through the key hole. I really don't want to spend $70+ on a new cap assembly if I can simply replace the seal.

Anybody have any suggestions on what type of rubber to buy to make a seal and where to get it? I think I can use the old gasket to make a new one.

Thanks,
Rich

[Guest]

The tanks actually use the key hole as a vent, so don't fill it to the tippy top or when the fuel warms up & expands it will seep from there...

Good idea to take the cap assy apart & clean it up - it has very small ball bearing under that plastic cap, along with some small springs, & "directional" washers/discs that act as a check valve. Clean up & lube accordingly. Take care when you take that apart & note the order of assy...

I would think any kind of rubber that oil/fuel resistant would make a gasket - the trick is to find something the same thickness as the stock rubber gasket.

Mike