REFLECTOR: Unbalanced fuel flow in flight

[Scott Baker]

Fuel flow imbalances, such as you describe, are often seen.
Jerry Brainard's note regarding fuel cap seals is one probable cause.
If the aircraft is out of rig, in this instance flying with the left wing 
low, will cause fuel to feed from the right tank first.
You have addressed the other major reasons for fuel flow imbalance - 
restrictions in the fuel supply and vent lines.
Suggest making additional flight tests (longer in duration), to see if the 
fuel level in the left tank begins to drop.
Best,
Scott B

----- Original Message ----- 
From: "Richard J. Gentil" <richard at naples-air-center.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, March 13, 2011 8:27 AM
Subject: REFLECTOR: Unbalanced fuel flow in flight


Friday I completed my second test flight.  I found that all the fuel drained 
from the right side and none from the left while on the one hour flight. (I 
actually cut the flight short due to this.)

When I landed I verified with my fuel stick that all the fuel did co e from 
the right tank.

For troubleshooting:

1) I removed the line from the left tank to the sump tank and verified that 
fuel did flow freely from the left tank.

2) Removed the vent line from the left tank and tested the line in the 
direction of the left tank and in the direction to the vent/overflow block 
at the top of my firewall using compressed air.

3) I checked the check valve for the air for correct operation in both 
directions and verified it was installed in the correct direction for air to 
enter and that fuel would not vent into the cabin.

4) Verified the overflow line was clear by using compressed air.

I know the picture is hard to follow but this is the fuel system:




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