Turn key can hear fuel pump run turn key to start my truck startes for two seconds and die do it three or four times will start will dun good for a week a do it again will run good three days do it again has new fuel filter and 60 psi 2000 gmc jimmy 4.3 vortex

Air in fuel system

It should at least run for several seconds after you turn the key on. It MAY run longer, but it SHOULD run for several seconds. If fuel demand goes down (engine not burning much fuel), the pump may not run after that.

The fuel pump may have died. Can you hear it turn on briefly, by turning the key to "on"? You may have to stand by the gas tank while someone turns the key to on. It should turn on for about 2 seconds and then stop, after pressurizing the fuel system. If you don't hear it, then check the fuel pump fuse. If the fuse is good, and the pump won't run, one needs to check that the fuel pump wire at the tank connector has battery voltage on it when the engine is cranking-then, you can assume the pump needs replacing.
If the pump is working and you have gas up to the engine, you would next check the ignition system. Start that by checking for spark on one of the spark plug wires.

no its not your fuel pump its your fuel pressure regulator next time you try starting your cartry this go on car turn your key to on possition for 5 seconds repaet three to four times then start the car if it starts right away then that is your problem replace the fuel pressure regulator also replace your fuel filter ok let me know if you still need help ok

It could be the crank position sensor or a faulty fuel pump

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

do you hear the fuel pump turn on when you turn the key to the run position? If not the check the fuel pump relay.

If the car will start and run for a few seconds then die, It may well be the crank position sensor.

can you hear the fuel pump kick on when you turn the key on but without crancking the engine? Generally the fuel pump will prime for about two to three seconds when you first turn the key on. if you don't hear it that's probably the culprit. If you do hear it it may be a bad pump. also should check to see if you have spark. You can do this by removing a plug wire and using another spark plug. Ground the plug to somthing metal and have someone crank the engine (making sure you are not touching the plug or metal) You should see a spark while cranking. Good luck

Well when you turn the keys on the pump will only run for a few seconds A test light works ok but i would use a volt meeter at th efuel pump power and groung wires and measure the voltage while cranking the car

Three things.
First, you need to check the MAF sensor for contamination.

Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.

Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.