1988 Lesabre Custom. 185k. Will know more later but suspect I need
to replace the fuel pump which AFAIK is in the tank. Can hear the
relay. Can't hear the pump pressurize when turning the key on t the
requisite position. Haven't checked pressure or the filter. Will
do. Problem was sporadic w/ no RE-start after running until 5-10
cranks for several months. That is to say: crank, catch, sputter,
stumble, die. 5-10 more cranks, then it catches. Battery good. Then
suddenly recently no start at all. Can anyone direct me to the
procedure in general or give me a short list of this that and the
other thing regarding the procedure? Thanks. Oh, and if it helps, I
do know my way around a monkey wrench :-)
if you pull the back seat lower section out and find the bulkhead
connector (thats where it is in chev at least) you can locate a LIGHT
GRAY (light gray powers all fuel pumps in all GMs) wire. that goes
directly to the pump if you want to power it manually.......i usually
pull pump relay and power from there..............kjun
The pump is in the tank.
First change the filter. When you remove the filter, empty it into a
clear glass bottle. Check the gas for water, which will separate from the
fuel and go to the bottom.
Then check fuel pressure. With the gauge attached to the fuel rail, turn
the key on for 5 seconds. The amount or pressure depends on which engine you
have. Once the pump is off, the pressure should remain. If not, you will end
up with vapor lock if the engine is hot.
You should get to this point before you pull the tank. To replace the
pump first, would be a waste of time.
These are general ideas. Changing the fuel filter sounds easy, but it
can turn into a mess. (gas and rust in your eyes, broken fuel lines, etc.)
When you have more specific questions feel free to post. Always add
Throwing $200 parts at it is not the way I would approach this problem
Kevin. It does not sound like a fuel pump problem. I'd start with
measuring the fuel pressure at the rail. Get a Haynes manual for the car or
DAGS, and you should find the pressure specs for your engine. It varies by
engine. If you are itching to just tackle something, then I'd go with a
fuel filter before I went for a pump with these symptoms.
Shouldn't I be able to hear the pump prime/pressurize when turning the
key to accessory or similar? Also, it USED to start (problem was
sporadic) after 2 or 10 tries when it got in this mood. Now I can run
the battery down without even a hint of it trying to start. Just
curious. Thanks for the pointers, gang!
I don't know about the accessory position for sure Kevin, but I would doubt
it. You would only need the pump to cycle when the key is turned to on, in
anticipation of starting the car. In accessory, the expectation is that the
car is not going to be started.
Your symptoms still sound like poor fuel delivery. Not to say that such
could not be a bad pump, but there are other, more likely places to look
first. You should start with some sound diagnostic procedures first, or you
can end up spending good money after bad, and not fixing the problem.
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