Finn,
Once again
the blind leading the blind, but it appears that wear and
old age has gotten to your pump. I suspect that as with the
second pump all is normal, then that excludes filter and
water etc, just needs a replacement pump IMHO.
Easy
when it is your money!
Neil.
Do EFI pumps have an internal check
valve? Dirty fuel filter?
Recently
I noticed my fuel pressure being low. Noticed because
engine did not come up in power when advancing to full
throttle. Noticed mixture real lean. Checking fuel
pressure as low as 28 psi (normally 35 and up to 40 at
full throttle).
Going
over my engine logs since first flight I now see that fuel
pressure has been trending lower through each flight --
more pronounced on longer flights (40+ minutes). More and
more pronounced over the months and became really
noticeable over last month. Could explain why mixture
tuning appeared to have changed. Nice to have
engine logs from practically each flight.
But why? Pump getting weaker?
My
primary fuel pump is a GSL414. I figured it was wasted
energy to push way more fuel than needed through the
pressure regulator back to the tank.
My
secondary (backup) pump is a GSL393. When turning that on,
fuel pressure comes back up to where it needs to be.
Anyone
have experience with failing or weak EFI pumps,
particularly the GSL414?
Finn
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