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1999 Chevy Truck wont start

Tiny
JOE WALKER
  • MEMBER
  • 1999 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
I drove my truck just the other day and now tried to start it and it would crank over, I can hear the fuel pump run, fuel pressure was checked and with the key on, it resistered 50psi. When we turned over the key the pressure dropped off. I want to said to zero but for sure to 40, not sure because I wasnt the one reading the gauge and its been awhile but before I replace the fuel pump I wanted to get a second opinion in case it may be some else. Please help!
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Sunday, January 27th, 2008 AT 3:45 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You need to reconfirm the fuel pressure it should not drop within 5mins to zero -if so you're losing pressure due to injector/s sticking open/pressure regulator and fuel pump check valve.
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Sunday, January 27th, 2008 AT 3:59 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hafa Adai Joe

Try this remove the gas cap listen to the fuel pump-while a helper turn key to On. When the fuel pump stops for that 2secs do you hear a trickling sound inside if so you have a problem with the Pulsator inside the tank.

The fuel pressure is just going back to the tank and not priming the injector/s.

To confrim it cycle the key a few times to build pressure and see if it will fire up the 1st time.
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Sunday, January 27th, 2008 AT 4:45 PM

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