Fuel Pumps

Hi,
I have had several 88 - 93 chryslers and I am about tired of changing
fuel pumps in the tank.
I now have a 1988 Chyrsler lebaron convt. Pump has gotten rather noisy
and would like to know if I can get away with hooking up a pump into
the original wire/ plugs and mounting out side some place.

also if so will the original pump alow fuel to flow with out running
it?
Thank you
Jami

 

All electric fuel pumps fail eventually, frequent and repeat
failures indicate that they are being murdered for whatever
reason.

There are a number of Asian imports that used external fuel
pumps on EFI systems, so yes, it is feasable but such a
modification would leave you wide open for liability should
something catastrophic occur.

Trying to pull fuel thru a stopped fuel pump with another
pump is only going to make the scabbed on pump work harder
hastening its demise. You'll also be inviting vapor lock to
occur somewhere between the two pumps. Whether it could do
it or not is irrelevant since it would be defeating a large
part of the reason you're modifying it to begin with.

Yesterday I replaced the original fuel pump, tank, sending
unit and straps on a 1990 Pontiac 6000 with 205,000 miles on
it. The replacement was not because of a pump failure, it
was because the tank, straps and sending unit were rusted to
the point that it all needed preventative maintanance, (the
new pump was insurance, though it looked fine on my
labscope). GM has no exclusive on pump longevity, so if
this vehicle owner can get decent life from his, one can
only wonder what you're doing to shorten your fuel pumps
life.

 

Consistently running with a fuel level under 3/8 tank. The in-tank
pumps use the the gas a a cooling medium.

No gas = Insufficient cooling = Premature pump failure.

--

 

Got my relacement from Carquest. they sell it as pump only or an entire
assembly for a bit more. I got the pump only and was able to transfer all
the other parts. Paid in the range of $90 as I recall.

Worth mentioning that the fuel filler neck has to come off when dropping the
tank out of the vehicle. This is a slip fit bushing into the tank. Replace
the bushing and lube the filler tube when re-inserting it. Avoids forcing
and tears.
Oppie

 

Yes, it is true that the fuel cools the pump (not that the pump produces
much heat). But it is the fuel that passes through the pump that cools it.
That means as long as there's sufficient fuel in the tank to keep the pump
suction submerged, the pump is adequately cooled. That's not much fuel.

If you actually run out of fuel, the engine will stop and that will shut
down the pump before any damage occurs.

I've always run the tanks on my fuel injected cars down to about 1/8 tank
before refilling and never had a problem with a pump failure.

 

If the tank is empty, the engine will stall. When the engine stalls, the
ECM will detect no ignition sync signal, and will trip the auto-shutdown
relay, shutting off the fuel pump.

In other words, "nope."