Hi David D;
I have a fuel pressure gauge which gives some indication of fuel delivery
health.
I use my auxiliary fuel pump, pre start, to "charge the system" Turn of before
engaging the starter. If you dont have to "drain" your electrical system with
unnecessary systems you will get a better chance of a "brisk" turn over &
engine
start (same with a road vehicle, turn of all non essential electrics befor
engaging starter).
I briefly use my auxiliary pump again during warm up to check for significant
rise/fall in fuel line pressure - health of the system check.
Auxiliary pump on for take off & climb out to safe altitude.
I dont put my auxiliary pump on again, until down wind for a landing/or low
level
pass. Pump is turned off when taxiing prior to engine shut down.
Your auxiliary pump is supposed to be a back up in the event of your main,
usually
mechanical, pump failing in whole/part. It is routinely turned on, during
critical phases of flight, when an engine fuel starvation situation may result
in a crash. It is also there for cruise flight if the mechanical pump fails.
It is not and never has been a continual fuel supply mechanism.
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