Replaced fuel pump,fuelfilter,oxygen heater sensor,cat.converter. Runs fine for awhile maybe 20 mins then acts like its running out of gas. Stop the truck turn off key restart runs fine, then same thing again, like it looses fuel pressure again. Turn it off start all over again like it resets im lost gm says needs fuel pump its new isnt there a simpler solution why i can restart and run fine again and again?
The fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.
Chk Mass air flow sensor (MAF) first sensor in ducting coming out of air filter.. Make sure your air filter is clean. Good luck. After all that replacing, I would be too sick to even sit in it.
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Thanks guys gonna try the MAF then pull the pump and return the malfunctional cheap one. Get a real one let you know thanks.
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