same question the car is a 88 buick regal in ref to stalling on the highway i how can it be the fuel pump if?

Question

the car is idling ok

Answer 1

Electric fuel pump means fuel injection, whether a throttle body or multiport fuel injection. The fuel pump will deliver the same pressure at Idle as it does at wide open throttle (aka WOT) the fuel pressure does NOT increase with engine speed. The engine rpm's increase because of the additional air when the throttle plate opens, and the injector providing more fuel either by opening more or staying open longer. If there is water in the tank or excessive dirt, rust or other types of grit in the tank, it could be plugging up the pickup screen causing your problem.
Another POSSIBLE problem is the timing jumping a tooth, perhaps back a tooth or two. This will retard the timing, enough for it to idle okay, but the timing can't advance enough to run at WOT.

Answer 2

I dunno if it''s the fuel pump. (did'nt see the original question) It may be a problem with yer fuel mixture. I had a carbureted 88 festiva I used to commute. It soon started sputtering and stalling out on the freeway. Turns out what it was was the carburetor was'nt getting the right signal from the O2 sensor. This caused it to dump the wrong amount 0f fuel into the carburetor, and would starve/choke the system. The car WOULD idle fine.Naturally, being a 65 mile commute, it'd reset itself by the time help got there, so it took an incrediubly long time, and obscene amount of money to get fixed. (did it myself for $30, 2 mos later when it went out again.\)

Answer 3

When the engine is under load, moving the car, it requires more fuel. If the fuel pump is in the tank and you run the fuel low the pump will overheat as the fuel acts as a coolant too. If the car is fuel injected it requires more fuel than a carburetor if the pump is week it will show up under load.

Answer 4

There is less fuel demand at idle. When you hit the pedal, demand goes up. If the pump is going bad it can't keep up and you get a stall.

Answer 5

I easily hate to advise a motor vehicle circulate to the broking, yet subsequently that's what i visit characterize. Take it in, provide them the history and what has been replaced already. in specific situations the production facility experienced human beings can locate issues others can no longer. definite, an air circulate sensor being undesirable ought to reason stalling. So ought to low gasoline rigidity, so ought to a plugged up gasoline filer, so ought to a foul throttle place sensor, and so on. and so on. Take it in. it may fee somewhat extra on the broking, yet while it gets fixed good it will be quite worth it.