Jeff
Suggest you take your fill cap and O ring to a NAPA store where they would have a variety of rings to match your OD and ring cross section. A hydraulic shop could offer same. Get a few extras and change out every few years to forestall water from entering fuel tanks as the rings give out, like your's did.
Jeff
Suggest you take your fill cap and O ring to a NAPA store where they would have a variety of rings to match your OD and ring cross section. A hydraulic shop could offer same. Get a few extras and change out every few years to forestall water from entering fuel tanks as the rings give out, like your's did.
If you cannot take the cap to the store because of a keeper chain, you could use a pair of calipers to measure the diameter of the O ring.
And, when you replace, smear grease top and bottom of the O ring to ensure a seal, wiping away the excess.
If you're using neoprene O-rings, grease, e.g. Vaseline or any petroleum product will soften the O-ring and cause it to swell, ultimately ruining it.
Get nitrile from a hydraulic shop. It's best if you can take the deck fill with to get a good fit. O-rings you obtain from an automotive supplier should be OK with oil, they're typically nitrile or other oil-safe composition. O-rings from the hardware store are likely to be neoprene, and petroleum products will ruin them.What material should I look for to replace the O-ring for my diesel fill caps? Obviously diesel is a petroleum product.
I bought replacement O-rings at West Marine, and although I got the right diameter, the rings are too fat (wide cross-section.) When I bring the old ones in to some place like NAPA, I want to be sure I get the right ones this time!
I bought the nitrile assortment from HF and they have come in handy on many occasions.
https://www.harborfreight.com/382-piece-o-ring-assortment-67554.html