I have bought a new fuel tank, with a screw on aluminium cap.  However, it came with no gasket to go between the cap and tank.  The original tank has a gasket, which looks like silver card.  What material to use to make a disc about 43mm diameter, 3mm thick?  Thought about using part of a wellington boot.  Ideas?

Thanks in anticipation.

 

 

Edited June 13, 20206 yr by stpauls

Depends on the design of the cap and what it screws onto. Some use a o ring. Some use a flat rubber seal.

Nebar      <<   https://www.tiflex.co.uk/nebar/nebar.html   >>

If your looking for the flat type seal. I used one out of a plastic 20lt can cap, (look around the caps come in several sizes), and are generally chemical resistant. 

Note; anything that has rubber or silicon in its makeup description may swell when in contact with petrol.