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tejas1 (Mechanical) (OP)
14 Dec 04 11:46
I need to replace the o-ring in my fuel petcock.  The o-ring will be in contact with gasoline.

I was wondering if I need to pay special attention to the material that the o-ring is made of for gasoline service?

The o-ring is metric and approx. 7/16 od X 1/16 thick (don't have the actual metric measurements).
evelrod (Automotive)
14 Dec 04 14:36
I used regular black "O" rings on the petcocks of my vintage Norton---I expect but have seen no problems in two years, at least, not yet.  I do have a set of the red "Viton" rings but I haven't needed to use them in this application.  Normally I use only the synthetic (vuton) in gasoline service, carbs, pumps, etc.

tejas1 (Mechanical) (OP)
14 Dec 04 14:41
Ok Rod.


Helpful Member!(2)  Pantaz (Mechanical)
20 Dec 04 22:33
Buna-N (Nitrile), and Viton© are the most commonly found o-ring materials compatible with gasoline. Many of the "regular black" o-rings are butyl-rubber, which will break down in gasoline.

Here's a very complete reference:

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