o-rings for gasoline service 2

[tejas1]

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]

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.

Rod

 

[tejas1]

Ok Rod.

Thanks,

Prabh

 

[Pantaz]

Buna-N (Nitrile), and Viton[sup][©][/sup] 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:
[URL unfurl="true"]http://www.efunda.com/designstandards/oring/oring_chemical.cfm?SM=none&SC=Gasoline%2C%20Automative[/url]