2001 GMC C3500 truck start to sumble ,hesitates

2001 GMC C3500
90,000 MILES • V8 • 2WD • AUTOMATIC
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MOPARFREAK414
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  • 1 POST
i have a 2001 gmc 3500 crew cab utility truck with the 6.0 engine.dual tanks ... truck started to hesitate while driving one day couldnt get out of it own way... next day would just crank .not fire.. no fuel... replaced fuel pump its been fine for about 15,000 miles then all of a sudden when driving again after say like 30 miles.. when u mash the pedal to the floor truck starts to stumble again... then dies... what could be the issue here... no check engine. no codes in history either..... also whats the normal fuel psi. with the vacuum to the pressure regualtor and with out
Dec 13, 2007 at 11:12 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
See below for regulated pressure-without the FPR should increase about 8-10psi over Hesitation try checking the throttle position sensor's closed and wide open throttle vpltages to include the MAP/MAF or engine load sensors.


https://images.2carpros.com/forum/automotive_pictures/12900_fuel_pump_pressure_1.jpg

Dec 13, 2007 at 11:29 PM
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