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Hi all....I need to ask a question regarding the
two EFI fuel pumps. (I have two MSD pumps, I think they are something like 65
psi each). Should these pumps run continuously? I know that on my
automobile, when you first turn the key (ignition), you can hear the fuel pump
run for a few seconds to pressurize the system, then it sounds like it shuts
off. On our aircraft, should they also do this or should they run continuously,
since the unused fuel is returned to the sump tank after the fuel pressure
regulator? I know that my MicroTech system has the wire that supplies
power to the fuel pumps going to a relay first, then the power leaves the fuel
pump relay and goes to the fuel pumps.
I know that most of you
have Tracy's ECU system, but if I recall correctly, I think that Ed Anderson had
used an automotive ECU (another brand) prior to changing to Tracy's ECU.
Just wondering how that system worked, regarding the fuel pumps.....constantly
running or on demand.
Thanks in advance for any
and all info you guys might have regarding how the EFI pumps are supposed to
work. Paul Conner
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