REFLECTOR: FUEL FEED

[Ron Brown]

Tom, 

An easy way to check the fuel caps is to run a tube to the vent line and blow in it and then pinch the line off.  Spray the fuel caps with Windex or a solution of dish detergent and water.  If the caps are leaking you will get bubbles.  

If the caps are leaking, use Vaseline on the O rings to improve the seal.  Also, there is an O ring on the cap's locking pin shaft.  You need to remove the nut and lube this O ring with Vaseline.   I also had to tighten my fuel cap locking nuts by about a 1/4 turn.  This should stop the uneven feed - unless you have a heavy wing - ball out of the center while in level, straight ahead flight.  

Oh and yes, at least one Velocity lost fuel feed when one tank emptied up due to the fuel cap leak, with several gallons left in the other tank.

Ronnie    
  ----- Original Message ----- 
  From: Gary Stull 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Sunday, February 13, 2005 3:42 PM
  Subject: Re: REFLECTOR: FUEL FEED


  In the past this has been caused by a fuel cap leaking. Since there's a vacuum on top of the wing, it causes that tank to have lower pressure and doesn't allow the fuel to drain from the tank. In some cases the fuel will transfer from the opposite tank because of the lower pressure.
    ----- Original Message ----- 
    From: Tom Martino 
    To: reflector at tvbf.org 
    Sent: Sunday, February 13, 2005 2:53 PM
    Subject: REFLECTOR: FUEL FEED


    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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