REFLECTOR: fuel feed - my solutions

[Brett Ferrell]

I don't avodcate sucking the fuel, but if you're drawing 15 gph, I don't 
believe the fuel is going to off-gas fast enough to fill the void, warm or 
not, so I don't believe that partial pressure will keep the check valve from 
opening and venting the tank.

Brett
----- Original Message ----- 
From: "Al Gietzen" <ALVentures at cox.net>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Sent: Sunday, February 27, 2005 6:29 PM
Subject: RE: REFLECTOR: fuel feed - my solutions


> 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
>
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