REFLECTOR:Gravity fed fuel flow

[Milton Mersky]

In addition to not being assymetric, it is quite possible that the two 
tanks are not exactly the same size and different amounts of fuel remain 
in each after a given period of fuel flow time..

milt

Scott Derrick wrote:

> With the KISS vent system as recommended by the factory, all vent 
> lines connected to a common manifold to maintain equal pressure on all 
> tanks, there are only two reasons why you would have un-equal fuel flow.
>
> 1.) Fuel cap leak.  Easy to fix, just get some fuel valve grease(it 
> won't contaminate your fuel nor dissolve and grease up the O-Rings 
> every 50 to 100 hours.  I do the outer ring every annual, the inner 
> ring should only need it every 20 years or so.
>
> 2.) Your airplane is miss-rigged and is flying in a permanent skid, 
> thus the fuel is being flung to the outside of the skid.  I think this 
> is the most common and overlooked reason.  Maybe people just don't 
> want to admit there airplane is a bit asymmetric?  A minor left or 
> right  rudder shimming will correct this.
>
> There just ain't any other way for it to not drain equally.
>
> I guess there is the very remote possibility that one of your vent or 
> fuel lines is almost completely plugged, down to a pin hole size and 
> is restricting the flow, but that's pretty easy to check by just 
> blowing on the line.
> Scott
>
>
> Dave Black wrote:
>
>> John,
>>
>>
>>> The important question is what happens after the first tank is down to
>>> 1/4?  Does the other tank catch up, or are you "out of fuel" once the
>>> first tank is empty?
>>
>>
>>
>> Fuel starvation occurs.
>>
>> Dave Black
>> Shortwing RG
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