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2003 Pontiac Grand Prix


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jimh74
New User

Feb 2, 2013, 8:07 PM

Post #1 of 6 (2027 views)
2003 Pontiac Grand Prix Sign In

I have a 2003 Pontiac Grand Prix. In November of 2012, the fuel pump went out and I replaced it. The car started right up and ran fine until this week. It was running fine. I shut it off and it would not start again. It acted just as it had before when the fuel pump went out in November. Thinking this was the problem, I replaced the pump again and it did not work. I thought maybe I had got a faulty pump so I took it back and got another one and I got the same result as before. The car acts like it wants to start but it is not getting any fuel. I am out of ideas of what it could be.


Discretesignals
Ultimate Carjunky / Moderator
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Feb 2, 2013, 8:37 PM

Post #2 of 6 (2003 views)
Re: 2003 Pontiac Grand Prix Sign In

Which engine?

What is the fuel pressure when it doesn't want to start? You'll need to connect a fuel pressure test gauge to the fuel rail test port.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 2, 2013, 8:38 PM)


jimh74
New User

Feb 4, 2013, 8:26 AM

Post #3 of 6 (1968 views)
Re: 2003 Pontiac Grand Prix Sign In

It has a 3.1 liter engine. I do not have a pressure tester, but removing the flow line and holding my finger over the port while attempting to start the car resulted in no pressure being produced at all. Am about to replace the relay switch undr the hood. I had overlooked this before because I could hear and feel it click when the key was turned. However, I am only getting around four volts before and after the body block and at the module plug. Is it possible for a relay to allow a pump to come on but not pump fuel?


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Feb 4, 2013, 6:23 PM

Post #4 of 6 (1950 views)
Re: 2003 Pontiac Grand Prix Sign In

If the relay energizes and the pump turns on but no fuel comes out, then it isn't the relays fault. It would have to be a pump issue or empty fuel tank.

If you have only 4 volts at the pump module when the relay is energized, you have excessive resistance somewhere in the pump's power circuit. Did you try swapping relays in the box to see if you get the full 12 volts?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


millz387
New User

Feb 9, 2013, 7:55 AM

Post #5 of 6 (1918 views)
Re: 2003 Pontiac Grand Prix Sign In

Check your crankshaft and camshaft sensors. they both work with each other when it come to starting. My crankshaft sensor went out and the car died. Sounded like it wanted to start but not getting enough gas. Pressure test it on the fuel line rail , if ok it has to be your crankshaft sensor, has to do with car timing. Located on most behind Harmonic Balancer. Some vehicles have two camshaft sensors. Unsure Good Luck!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 9, 2013, 8:01 AM

Post #6 of 6 (1915 views)
Re: 2003 Pontiac Grand Prix Sign In

Milz387, Please refrain from giving advice on subjects that you are not versed in.

OP, please disregard the previous advice and continue testing.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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