Fuel pump runs all the time - 1997 Chevrolet K1500

I would suspect that the fuel pump is no good. Running an electric fuel pump on empty tank is inviting problems.
Sometimes if a vehicle runs out of fuel it can get air in the fuel lines. Any time a vehicle runs out of fuel and more fuel is added, the key should be turned to the 'On' position then back to the 'Off' position three or four times to prime the fuel pump. Priming the fuel pump will remove any air that may have gotten into the lines as a result of the vehicle running out of fuel.
If priming the fuel pump does not start the vehicle, I would recommend having a fuel system inspection performed by a qualified professional

Did you fit a new fuel pick up screen to the pump? Does the problem still occur with the fuel cap removed?

you say fuel pressure is good, but what is it? what is the fuel pressure when it stalls out? Spec is 60-66 psi and it wont run if its 55 psi. the fuel pump relay should be good if the pump runs. Make sure the ground for the pump is good , G402 should be on left frame rail. you may have had it off to replace the pump? maybe? it may be time to stop guessing and have a repair shop diagnose it for you. You sure have replaced a lot of good parts.

If the pump starts to jam it wills seem like it won't run. The stuttering on startup is also related to a failing fuel pump as the intank pumps in our Jeep (I have the same ZJ)

Next time it won't start, try hitting the fuel tank with a small hammer (lighty as per not to crack it)
This can sometimes jar the pump in such a way to get the fins spinning again. If this works I would reccomend replacing the fuel pump.

You should also hear the pump prime when you turn the ignition to on (before start)
Priming the pump 3-4 times can help the stuttering on startup.

You can also get a fuel line pressure tester from most auto parts stores and verify that you are holding pressure after the pump is off.

Cheers
Dave

might of clogged filter also 2 gal might not be enough check for fuel pump noise also when you run these cars out of fuel the pump over heats and goes bad

fords run two (2) relays for the fuel system one runs the fuel pump and the other runs the injectors so buy one relay and just switch one at a time you will be up and running in no time.Hope this helps you.

wrong fuel pump? wires crossed, fuel pump should run when car is on, this is what keeps it running, maybe fuel pump is louder than original and you notice it more. Check your fuel filter. Get a tune up........

Did you replace the fuel pump with a NEW fuel pump, or a used one?
Get in the car, insert key and turn to "On". Do not attempt to start. Do you hear the fuel pump run for a few moments? Try it a few times, starting the car each time after you hear the fuel pump run. If the fuel pump does not run, then chances are, it's a bad fuel pump.
It could also be the fuel pressure regulator, located on the fuel rail.

Your statement about the oil is confusing.

Hi Bill,

I've got a 91 Wrangler. I'm not sure what your problem is though.

I assume you have the 4.0l fuel injected straight six.

Is the fuel pump on all the time?

Does the car run?

Could you comment back with a bit more detail about the problem?

Thanks
Mike

check the fuel pressure before and after its running i asume its fuel injected