Mike,
Here is the way I'll doing. I have the mechanical pump as a standby-pump on
the engine. The fuel is going through the pump all the time in bypass, that
means all the fuel which is going through the mechanical pump goes via a
electrical valve back to the tank. In an electrical emergency, the valve
closes and the pump keeps the engine running up to ~2000m and ~55% power.
The fuel-pressure (Airbox pressure + 0,35 bar) is secured up to this
altitude and power setting. You can check the Airbox-Differential-pressure
with the new "uma"-gauge. www.umainstruments.com This instrument is the only
indicator for the fuel pressure on 914 engines which makes sense.
For checking the bypass-system the electrical pumps can switched off
momentarily after engine start.
Regards,
Gottfried
-----Ursprngliche Nachricht-----
Von: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] Im Auftrag von MICHAEL
PARKIN
Gesendet: Mittwoch, 22. Februar 2006 21:52
An: Europa-List@Matronics.Com
Betreff: Europa-List: 914 Fuel Pumps.
--> <mikenjulie.parkin@btopenworld.com>
I am not sure whether it was Europa or not, but I heard that someone was
investigating putting the manual fuel pump on the 914 with electrical back
up pumps for the high demand situation. Sounds like a good idea to me.
Does anyone know anything about it.
regards,
Mike
|