MY 1994 5.7 1500 RUNS FOR A LITTLE BIT AND THEN SHUTS OFF,I CHANGED THE FUEL PUMP FUEL FILTER,IGNITION MODULE.IT STARTED RIGHT UP AND RAN FOR ABOUT 20MIN.I THEN SHUT IT OFF & LET IT SIT FOR 5 MIN.IT STARTED RIGHT BACK UP RAN FOR 30SEC. AND SHUT OFF.THEN ALL IT WOULD DO IS CRANK & NOT START.IT DID THIS FOR ALL 3 THINGS I CHANGED.

Please help, my truck runs then shuts itself off and fuel pump is working. Well then ,it's not the fuel inertia switch . Your guessing because you have no clue . Probably ignition problem . When it shuts off does it start right back up ? Or do you have to wait a bit ? If you hear the fuel pump running the inertia switch is fine ,this switch shuts B+ voltage off to the fuel pump . So if you hear the pump running it's not the inertis switch . There is also an ignition system , check for spark , pull a plug wire off an hold near ground . Probably the ignition module .

sounds like a fuel filter issue is there an inline filter

I know its a pain but i would drive it with the fuel pressure gauge on it and see what fuel pressure is at when it stalls also scan it for dtcs and if none found suspect crank sensor

sounds like a faulty pressure regulator be sure to test it before changing it

Sounds like your fuel pump is weak so i would check the fuel pressure first.The fuel pressure should be 40-47 psi with key on and engine off and 31-44 psi with engine running.If its not within these specs then replace the fuel pump.

try the engine coolant temp sensor!

Misfires are caused by loss of either spark, gas, or compression. Most likely you have lost gas. Spark is normal? Compression is probably okay. Check your fuel pressure-especially when it has stalled and won't restart.

monitorize fuel pump pression during the idle march. Is not rare that a new pump be bad fuel filter must be revised or change

well you can check the ignition control module or crank sensor somtimes when they get hot they have a crack and will get worse when hot hope this helps

Best to do a fuel pressure test, pump might be weak and dosent show up until it gets gets warm. Best to do the test after it quits again when pump is at its hottest. If you havent done it yet chg. fuel filter too.