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A comment on How to make a leather piston seal (2007). Parent comment

Re:How to make a leather piston seal (2007) by Xylakant on Thursday July 22, 2021 @09:26AM (#27918560)
In a fuel pump, the washer also has contact with substances that are aggressive to rubber: the stove fuel itself. I doubt a rubber o-ring would survive long in that environment.
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Re:How to make a leather piston seal (2007) by dwater on Thursday July 22, 2021 @09:42AM (#27918719)
There are fuel resistant rubbers available, most commonly Viton/FKM. They are commonly used in automotive applications.

https://en.wikipedia.org/wiki/FKM

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Re:How to make a leather piston seal (2007) by mauvehaus on Thursday July 22, 2021 @01:38PM (#27921878)
The pump cup, in theory, never touches fuel. And goodness knows MSR isn't shy about using O-rings. There are nearly half a dozen in a Dragonfly between the pump and the stove. They're using a material that holds up to fuel contact for those.
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