REFLECTOR: FUEL FEED

Scott Derrick scott at tnstaafl.net
Wed Feb 16 10:16:44 CST 2005


Jim,

Obviously you have something really wrong or should I say "very 
different" from the factory configuration.

The proof is in the pudding. 

Find and correct that difference and your fuel flow would be per design.

Scott

Jim Sower wrote:

>
>
> Scott Derrick wrote:
>
>> 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.
>
> That's what I thought.  It's the first thing I did.  Leveled the 
> airplane w/laser level, checked the ball centered, flew a couple of 
> test hops and shimmed it to perfectly centered ball.  Had no 
> measurable effect AT ALL on assymmetric transfer.
>
>>
>> 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.
>
> At full rudder deflection I was able to transfer maybe 1/2 gal / min.  
> Took 10 minutes to transfer five gallons (that was on a GOOD day.  
> Other days it was less.
>
> Sometimes nothing at all seems to work ... but I finally fixed it ... 
> Jim S.
>
>>
>> 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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