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.
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.
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