REFLECTOR: Fuel venting issue

[Tom]

It does appear to me that it simply vents independantly under each wing. However--it was behaving as described below, ie;
draining at the left tank but also emptying the right one. I think it can do this because the tanks are both connected to 
the sump and the sump isn't vented (so it's like one big tank).I also have a fuel smell all of the time in the cabin (no leaks)


I think that he does not run the vent into the cabin- each tank vents
separately outside of the aircraft like a  C-172

-----Original Message-----
From: reflector-bounces at tvbf.org <http://www.tvbf.org/mailman/listinfo/reflector> [mailto:reflector-bounces at tvbf.org <http://www.tvbf.org/mailman/listinfo/reflector>] On
Behalf Of Laurence Coen
Sent: Sunday, July 01, 2007 1:31 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Fuel venting issue

Tom,

The first thing I would ask is does your vent line go to the top of the 
firewall before it heads to the bottom exit point.  If it doesn't, it 
should.  If your vents are tee'd together at about the top of the tanks and 
then straight down, here's what can happen.  If the plane is sitting with 
the left tank slightly higher than the right, filling the left tank can 
cause fuel to cross flow through the sump into the right tank and out the 
right vent line if the right tank is already full.  Fuel will continue to 
siphon until the vent in the right tank un-ports.

Larry Coen
N136LC
SE/RG Franklin/IVO

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