Your post is lacking any detail. However, if you are stating that the engine starts after being cranked but dies out (wont stay running) there are 2 ways the fuel pump is activated. When the key is first turned on, there is a 5 second fuel pump run (the ECM energizes the fuel pump relay). After the engine starts, the fuel pump relay will only stay energized when the oil pressure switch closes keeping the fuel pump relay on (oil pressure is above 5-7 psi). If the oil pressure switch is faulty or there is no oil pressure, the engine will stall just after starting.
SOURCE: Truck cut off, there was no gas going to carburator.
a shorted relay can cause this also a wire rubbed through from when fuel pump was installed. check for cracked wire insulation.
SOURCE: no fuel pressure put in a new fuel pump assembly a...
Did you actually verify the fuel pressure at the fuel rail? If so, there are some other things to check, fuel filter, fuel rail pressure regulator and an obstructed fuel line.
321 views
Usually answered in minutes!
×