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Solved this problem many years ago by cutting the fuel cup seal shape from a cork sheet. The cork isn't affected by the fuel solvents.
Easily done by using a pair of compasses to measure and draw the inner circle and outer one
Still in its place after so many years.
I've used this for a jerry can cap that I had problems getting a seal on.
Nitrile Cork Sheet - 300mm x 214mm x 1.5mm A4 SIZE SEAL JOIN FREE POST | eBay
used for diesel and has been in service for at least 2 years without any problems. I think your rubber problem might be that they have given you natural rubber. Neoprene is OK to good and Nitrile is generally listed as Good to Excellent.
Cheers Glen
Quote:
Originally Posted by Dorian
Ahhh, that makes sense. I was a bit surprised when it started to deteriorate so soon. Thanks for the link, that makes it easy. Just ordered a sheet
A quick follow up, I’ve cut a new seal from neoprene cork and it’s working a treat. No diesel dribbles