Truck not getting fuel mechanic says fuel pump

It sounds like your car isn't getting the proper amount of gas. You say your mechanic changed the fuel pump and the regulator. Id have him run a diagnostic tool on it to see if it throws any other codes. Its getting fire. Try changing the FUEL FILTER. it maybe clogged. maybe the pressure regulator is not giving it enough pressure to push the gas into the engine or maybe the fuel pump is only working at times. Does it run good and then start to spit and spudder then die? if so its not getting gas some how. Idk if you can adjust the pressure regulator or not. i mostly work on old school cars.

A mechanic would use starting fluid to suppliment the fuel supply. Then check for fuel pressure with a gauge.
It could be the pump relay among other things.

replace fuel line from fuel tank to fuel pump. this are metal hoses so a specialty shop for this should be in your priority

ok first question where did you buy the fuel pump tell me other try this when car is not starting go to fuel pump get a circuit tester have somebody else turn key to on position for ten seconds turn off then again if no noise from pump check for power at fuel pump there should be one wire that has power for obout ten seconds then cuts of. if power to pump and it does the ten second on and shuts of by it self then you got a faulty pump, now if no power at all on ten second teste then get a long wire thay can reach from battery to fuel pump hook up to your battery go to wire at fuel pump and hit it with wire from battery if you can hear pump going on them you have a bad contact ether at fuel pump conector or at relay conector or bad wire one thing when looking at conector at fuel pump you will find sevral wires two wires are for fuel level one power on ground other wires are for pump one ground and other for power to pump if any question ask me i will help i am a mechanic let me know

I was told that some fuel pumps do not work more than a day or two, replace the fuel pump again. Mine came with a warrenty

Check the fuel pump relay?

Either coil is getting hot and shorting out or fuel pump is acting up.

if you have been having problems since the shop had it I would take it back so they can go over everything they might have touched.. Also GM fuel pumps for from 97 to 2002 are known to have the symptoms your describing before failing completely. Only way to know is when it does not start try spraying some quick start or brake cleaner to see if it will start. Or have a pressure gauge hooked up. When you say it has fuel presuure that means nothing if you can't verify it has the proper pressure.

If it still doesnt start when you spray then you will know its ignition related and not fuel related. Try rotating the relays for the fuel pump with the ABS and any PCM sounding one with the horn. Also inspect fuses for hairline cracks that may open when hot. Rotate the logical ones there also.

The crank sensor and the coil could have been tested before you replaced it but since you did already one other option is if you have a cam sensor it also can causea no start. If you know how to use a meter test components before replacing. Go to youtube. Alot of hands on tutorials. Or do a searh on how to test a componant.

TRY ANOTHER FUEL PUMP AND FUEL FILTHER THESE PUMPS ARE FUNNY ON VOLVOS HAD SAME PROBLEM ON 850 TURBO AND SURE ENOUGG IT WAS THE PUMP

There is probably a fuel relay somewhere in that circuit to, that may be faulty. Check your front drivers side inner fender by shock tower for 3 relays. It should be the middle one.