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Will not stay running

Tiny
MATTBOW
  • MEMBER
  • 2008 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • 130,000 MILES
Vehicle will start for about 2 seconds, then shut off, no security blinking at me, fuel pump is less than 5 months old, delphi FP too. Pressure at fuel rail goes up to 5 psi then goes to zero right away. I have power to the pump, pump does it few seconds cycle, I have ground and power to the EMC, is it possible it's the fuel pressure regulator in the pump? I have a full tank of gas, and no easy way to get it out, haven't found much info on later Tb's online, more misinformation than anything, lol. Thanks
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Wednesday, June 24th, 2020 AT 3:26 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Your issue is the fuel pump itself.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

The spec is much higher than what you have measured. I posted the spec below for you.

Fuel Pressure (Key ON, Engine OFF) .................... 345-395 kPa (50-57 psi)

You will need to change the pump again. It should be under warranty if it is 5 months old.

I would get a siphon at a parts store and some 5-gallon buckets and remove as much fuel as you can to make it easier to drop the tank.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy
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Wednesday, June 24th, 2020 AT 4:22 AM
Tiny
MATTBOW
  • MEMBER
  • 2 POSTS
Thank you for info. It's what I expected to hear, but doesn't hurt to ask for reassurance. As far as getting the gas out, it has a anti siphon flap, if I take off the the filler neck assembly to the tank, will I be able to get the flap opened enough to get the fuel out?
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Wednesday, June 24th, 2020 AT 4:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Yes, you can for the removal.

Always glad to help.

Roy
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Wednesday, June 24th, 2020 AT 5:20 AM

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