REFLECTOR: fuel feed - my solutions

[Al Gietzen]

Subject: Re: REFLECTOR: fuel feed - my solutions

As soon as the pump pulls some fuel out of the sump with a blocked vent 
line, the check valve will open and vent some air into the tanks.  1 
atmosphere versus vacuum will open nearly any check valve

Of course you don't really have that option since warm avgas has a vapor
pressure of around 8-9 psi, and warm mogas 10-12.   Which means at _______
ft, you have no "suction".
That's why you don't want to depend on sucking fuel anywhere.

Al