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Car Forum / GMC Cars / April 2006

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Chevy Cavalier 95 - fuel pump problems

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Century Sam - 02 Apr 2006 21:48 GMT
Hi There,

I've been experiencing some problems with my chevrolet cavalier 95 since the
end of 2005. The engine is stalling at idle speed and at higher rpm.
Sometimes I can run the car for days before I have the problem again. Here's
the list of things that I changed : ignition cables, gas filter, air filter,
spark plugs. I had the the tank fill line repaired because it had a hole in
it. When changing the gas filter, it was full of dirt (looked like mud). I
decided to have a look at the fuel pump, listening to it to see if it
stopped while the car was running. The strange thing that happens is that,
just before the idling gets rough and the engine want to stall, the pump
sounds like it's going faster. It goes fast, slows sown, then fast again,
but it never stops turning. It sounds like there's no gas to pump but the
tank is full.

Ever experienced that kind of problems ?

thanks for the help

Sam
=AB Paul =BB - 03 Apr 2006 00:07 GMT
> Hi There,
>
[quoted text clipped - 16 lines]
>
> Sam

Nearly all of us have experienced those kind of problems.
What is the fuel rail pressure just before stall?
Nomen Nescio - 03 Apr 2006 21:40 GMT
If your fuel pressure is marginally low or intermittent, the engine light
will illuminate.  Turn the key on-off-on-off-on and the actual pressure
will read out on the speedometer display in real time.

If the fuel pressure is too low to power the injection system, you will
hear an audible warning and a flashing engine light.

GM engineers wanted to equip your car with a back-up pump that
automatically kicks in when the primary pump quits, but top management
nixed it because it costs about twenty bucks.

But, at least you have instrumentation to help the mechanic pinpoint the
trouble, otherwise you would go through Hell and might even end up dumping
the car.
 
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