Fuel cap

[The Black Pig]

I'm looking for a cap for a auxilliary petrol tank the vent screw is missing and it is cracked and leeks
It is a 25 litre American tank
Any sources to recommend?

Thx

[Poly]

I believe there are two standard sizes. Can you take a pic with a ruler as I have a spare one the wrong size!

[The Black Pig]

The make of the tank is chiton an American manufacturer but quite old I will measure when I can

I am lead to believe they deteriorate even if out of the sun causing plastic floaters in the tank?

[jyasaki]

What exactly deteriorated? If it's what I'm picturing, the cap should be plastic, the grommet rubber (or neoprene or similar, most of which will likely deteriorate if exposed to ozone), and the vent a screw valve with rubber seals.

jky

[The Black Pig]

The vent screw thread stripped letting out petrol and saltwater in so it rusted the metal indicator plate inside, plus the clear plastic cover cracked maybe from over tightening

As a separate issue because it's old I am concerned about the tank deteriorating inside with said floaters

[jyasaki]

Ah. Gotcha.

If the tank is polyethylene (red plastic), it will more likely crack than flake as it ages. If it's metal, it's probably painted steel and will likely be rusting as well.

jky

[VanillaIceCream]

Take a picture, I have a few old portable outboard tanks that I could cannibalize and send you a fuel cap.

Erik

[m chappelow]

You can have this redundant one that i dont need if its any use ?