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1. 01:48 AM - Re: Secondary Fuel Pump, correct or not (josok)
2. 11:34 AM - Re: Secondary Fuel Pump, correct or not ()
3. 11:34 AM - Scandi fly-in (josok)
Message 1
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| Subject: | Re: Secondary Fuel Pump, correct or not |
Ron,
Obvious mistake: I should have said liters per hour, not minutes.
The fuel flow test does not test the flow to the engine, it tests the total flow
out of the tank. While it is a good indication of the condition of filters and
pumps, it does not test the fuel pressure regulator. For fuel pressure over
air box i have the UMA sensor.
Based on a few years of reading of accident reports and forums, i think that this
total flow check before take-off would have grabbed almost all of the fuel
starvation mishaps caused by clogged restrainers, filters and rotten fuel lines.
If there has been any mishap with the fuel pressure regulator, i have missed
it.
Leaking connections i have had, both a damaged o-ring on the gascolator, and a
poor flange on the alu pipe near the fuel selector. While these caused a hell
of a smell, and some fuel under the plane, the fuel test was still over 120 liters,
and over 135 liters with 2 pumps on.
Those numbers are based on my "clean" system, to have a repeatable test. Different
systems will produce different throughput, and also the battery condition
is a factor.
Regards,
Jos Okhuijsen
Visit - www.EuropaOwners.org
Message 2
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| Subject: | Re: Secondary Fuel Pump, correct or not |
Hi Jos
"over 120 liters, and over 135 liters with 2 pumps on."
This is probably very close to what I tested.
I have a UMA differential gauge, and a UMA fuel flow gauge. I asked Ed if
he could give me a switch to read just outgoing sender on my analogue
display, but was not cost feasible.
I think you have a nice feature being able to read total flow one pump at
a time and both pumps.
To make total flow number mean more, you could do a couple of tests:
Go to full power on 1 pump, then turn off fuel selector, a little bit at a
time till you see differential pressure needle begin to go down, and below
2PSI and note your fuel flow.
Would be nice to see difference between lower and higher altitude.
If you don't mind sharing these results it would be greatly appreciated.
The fuel pressure regulator has a built in restriction. You need to meet
the required flow rate that will create enough pressure because of this
restriction to crack open the regulator and allow fuel to flow into the
carb float bowls. Each system will be slightly different due to execution
of system.
You have the opportunity to learn what this flow rate is at various
altitudes (thin air, high boost most flow rate will be needed because
motor is gobbling up some flow, and you need higher regulator pressure
when boosting and since you are trying to overcome airbox pressure that is
absolute, when ambient pressure lowers, you need more regulator pressure
compared to higher ambient pressure).
Ron Parigoris
Message 3
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Stefan Ingemarsson asked me to post this invitation for the Swedish Europa fly-in
on the forum. The event will take place the 27-29 of June 2008 at Skvde ESGR
5827'22'' N 1358'22'' E
6 NM/11 KM NE Skvde k:a
See attached file (hope it will be copied to the Matronics list)
Regards,
Jos Okhuijsen
Visit - www.EuropaOwners.org
Attachments:
http://www.europaowners.org//zfiles/europa_nordic_fly-in_2008_728.pdf
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