Subject: RE: Petcocks and Fuel Flow
Author: John Boettcher
Date: Apr 6, 2003, 5:48 AM
Post ID: 1712523191
Initially it was because I had used BUNA petcock gaskets,
which disintegrated under the influence of petrol.
Tom
I use Buna N quite sucessfully. Problem is most Buna N that is easily
available is around 40 durometer in hardness, that will tear as Tom
describes. I found some that is 70 durometer and has worked on several
petcocks just fine.
Most petcocks leak when there is a lack of use with turning them on and
off. The gasket swells over time into the divot of the on/off device and
gets hard. When you turn the petcock later, it cocks because of this
swelled lump and of course, leaks.
JB