2000 Chevy Silverado Engine Dies, Then runs rough

Tiny
DOUBLE A
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
My truck is intermittently cutting out. I was told by a repair shop that my crank shaft position sensor was bad so I replaced it. It ran great after replacement and then out of the blue it stumbled on the highway and died. Now it seemed like the longer I let it set the better it would try to start. But then it dies once I try to give it any gas. I sprayed starter fluid in during one of these episodes and the thing cranked right up for a fews seconds on that. So im thinking its the fuel pump but before I replace it is there any sensor that may be bad? Right now it starts great until I give it gas and it starts to stumble like it loses fuel. I checked the fuel pressure regulator and it has no gas in the line. It also runs the same way with the MAP sensor unplugged. I even replaced the fuses for the fuel pump. No check engine light either. I also replaced fuel filter.
Thursday, April 16th, 2009 AT 3:42 PM

5 Replies

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Check fuel pressure, it should be 60-66psi. Post back with what you find and will advise.
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Thursday, April 16th, 2009 AT 9:02 PM
Tiny
DOUBLE A
  • MEMBER
  • 12 POSTS
Okay, I had to get a gauge but I checked it and when I first turned the key on it read about 40 PSI. Then when I cranked it up it stayed there for a few minutes and went up to 49 PSI. I unhooked the vaccuum hose on the regulator and it hoped up to around 55 - 60 PSI, but was eratic. Also when I racked the throttle it lost about 4 PSI every time. So what next? Should I put another fuel filter in? I changed it about two weeks ago. The old one had some trash in it, looked like shinny pepper flakes when I removed it. But it was the first time that I ever changed it in 130k miles. Thanks for the help.
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Saturday, April 18th, 2009 AT 12:10 PM
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
To answer your question, it has all the simptoms of a bad fuel pump, if you havent changed the fuel filter in that on that much milage it killed the fuel pump. These fuel pumps are very delicate to debress. If you have 40psi that is only enough fuel pressure to maybe have the vehicle run poorly, these vehicles need at least 55psi to run, if you loose fuel pressure when increase the throttle thats a bad pump.I would replace the pump and check the tank for any material and clean the gas tank.
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Saturday, April 18th, 2009 AT 3:19 PM
Tiny
DOUBLE A
  • MEMBER
  • 12 POSTS
Do you think I should replace it with a aftermarket or OEM? If OEM why is it better?
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Saturday, April 18th, 2009 AT 3:44 PM
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Personally I would go with OEM, because its better quality and it has a good warranty, aftermarket are usually poor quality even if you get an expensive one. Plus its an electrical part, if the aftermarket one keeps dyeing you have to keep replacing it, with an OEM you probably only have to replace it once. Its your call which way you want to spend your money. Your call.
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Saturday, April 18th, 2009 AT 3:49 PM

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