Dave,
My set-up is exactly the same as yours, with the two pumps as per Europa and
I have the same pressure rise with the second pump on. I always have both on
for take-off and landing as per the manuals. Works well!
Sue and Bill
----- Original Message -----
From: <DJA727@aol.com>
Subject: Europa-List: 914 fuel pumps
>
> I have always used 2 pumps for takeoff in Piper Aircraft. In the 914
engine,
> there are 2 electric fuel pumps. I have assumed both would be on for
takeoff
> and landing. The fuel pressure is regulated in that engine to 3.5 psi
above
> airbox pressure.
>
> When I am at a constant power settling. My fuel pressure increases by 2.2
psi
> with the second pump turned on. Rotax only allows a range of 2.0 to 5.0
for
> normal differential fuel pressure. Increasing the pressure by 2.2 is
almost
> the whole range! I also have evidence of rich running, which has subsided
> since I started to run with one pump only during takeoff and landing. (My
> system will automatically activate the second pumnpm if the first one
fails).
> I can't see anywhere that Rotax addressees whether or not the two pumps
are
> meant to be run at the same time for safety purposes. To add to the
dilemma,
> the Rotax manual has the pumps in series, where Europa has them in
parallel.
> I have mine per Europa.
>
> Simple question: What are people doing in operation? 1 or 2?
>
> Thanks,
>
> Dave
> A227
> Mini U2
>
>
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