"Backyard Mechanic" <email@example.com> wrote in message
> Contrary to what some believe, it's not necessary to keep your tank at
> any given level to prevent your fuel pump from "burning out".
> Inspection of any pump/sender assy will bear this out. If such were the
> case, the pump would be shaped like a large flat can and be right at the
> bottom of the tank.
> In fact, you are FAR more likely to burn your pump out prematurely if you
> have a clogged fuel filter.
> It's gas flowing THROUGH the pump that provides the cooling... and on EFI
> systems that use fuel rail regulators and return lines, the flow can
> diminish enough to allow the pump to overheat while there is still enough
> flow to run the engine.
Your gonna start a fight on this one BM. I think its the "suck air and then
all of a sudden fuel syndrome" that kills the pump if you run it way low.
Think about it, you make a turn the pump sucks air, then you straighten out
and it catches fuel again.(lots of strain on impellers.) Its like revving
your boat with the prop out of water and then suddenly dropping it in the
lake. The prop shear pin will break I bet. (haven't tried it) :)
I do think your right about it not being heat (although I've seen lots of
burned wires on bad in-tank pumps. (on GMs).Come to think of it, I don't
recall the last Ford pump that's has failed, lots of Chevy's though.