Quit running relpacxed fuel pump still no start

Vehicle information needed.

What make , model and year vehicle ? It makes a difference . It does start but stops running right away ? Before replacing the pump and regulator did you do a fuel pressure test ? Hooking up a fuel pressure gauge ? Or just guessing that was the problem ? And did your test the electrical circuit of the fuel pump ?

Also what no one is mentioning is to make sure you have oil pressure, or that the oil pressure sensor is working, alot of newer vehicles run the fuel pumps off of them oil pressure sensor so if your vehicle stops pumping oil and lubricating, it shuts the fuel pump off to protect itself from damage or further damage

Found on a '92 Toyota pickup w/V6, a bad/intermittent fuel pump relay.
Had fuel rail pressure so fooled us initially, found by listening to pump run then quit, cycle key and pump would run again then quit, sometimes when trying to start, motor would start and run for a few seconds then quit, or not start at all, this created by intermittent relay operation. Need two people, one at passenger side by tank and other to work ignition switch.
Relay located behind right, passenger kick panel, dealer item I believe about $28.00.
Just another possibility.

fuel pump relay. ther 11.99. if thats not it check your fuel injectors. im 99.99% sure its your relay.

Check to see if there is any power getting to the fuel pump, if there is 12 volts going to the fuel pump then replace the pump, if there is no voltage present, the problem could be the fuel pump relay, a fuse, or a break in the wiring.

You could have a bad fuel pump relay switch. The fuel pump relay switch gets the fuel pump running in the vehicle during the start cycle. The terms fuel pump relay and fuel pump relay switch are used interchangeably. The fuel pump relay begins its job when the automobile operator turns to the ignition on, but before the motor is actually running. At that point, the fuel pump relay in some cars sends a signal to the ignition switch, which in turn sends a signal to the fuel pump to turn on. Others fuel pump relays have actual circuitry inside of them that receive the ignition signal and directly signal the fuel pump to engage.

Have a great day!

Replace the fuel filter first,if sitll the same change the pump.

I see you say that you have a new fuel filter but did you try replacing the fuel pump??? If not you can check the fuel pump simply by turning the key to the ACC position (thats as far as you can turn the key WITHOUT starting the truck) listen by where you pump the gas in and try to hear a low sounding whine if you cant hear it then it could be your fuel pump is dead and needs a new one....or it might be going dead.

It sounds like you have a defective fuel pump or a bad fuel pressure regulator.