REFLECTOR: FUEL FEED

[Scott Derrick]

A leaking gas cap can cause uneven fuel flow but is not the prime 
culprit. A bit of fuel valve lube applied to the O ring once a year will 
insure this doesn't happen.

A miss-rigged airplane is most likely the cause. Shim your rudders so 
the ball is right in the middle and you will get perfect fuel flow.

To test, be sure your turn and bank is installed correctly first, 
garbage in garbage out. Then fly, this is the fun part.. Once you see an 
uneven condition, press on the rudder that will put the ball in the 
middle. If you want to even up the tanks fast, press on the correct 
rudder so the ball is on the other side for a couple minutes, you'll see 
the fuel even up and even go into the opposite imbalance if you keep the 
rudder depressed. Then hold the rudder so the ball is centered, fuel 
will flow as it was designed to.

Scott

Tom Martino wrote:

> Well, now that I’m in my test flying mode ... I will really be asking 
> a lot of questions.
>
> Here are some of them, as they relate to my fuel system:
>
> 1. What makes the fuel tanks feed unevenly to the header tank/engine? 
> (My right tank is feeding twice as fast as my right tank.)
>
> 2. Will that cause a problem when the fast-feeding tank runs out?
>
> 3. I used the larger vent lines for my tanks and tied them al together 
> with a manifold, then vented the entire system out through the top of 
> my firewall in the engine compartment (about four inches below my naca 
> duct). Do you think the system gets enough venting there?
>
> 4. Is there a need for a “whistle” hole in any of the tank vents ... 
> for additional venting (like we do with the crankcase breather?
>
> Any help is appreciated from my more experienced Velocitologists J
>
> Tom
>
> N173EX
>
> (A mere 6 hours)
>
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