Fuel pump

Tiny
MATTYGW
  • MEMBER
  • 1995 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 116,000 MILES
Where is the fuel pump located on car? How do you diagnois fuel pump failure? Car will not start after running out of gas, put about 5 gallons into tank and wont start.
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Friday, February 19th, 2010 AT 3:58 PM

21 Replies

Tiny
RASMATAZ
  • MEMBER
Its in the fuel tank

Do you hear the fuel pump come On for 2 seconds? if so check the fuel pressure if its within specs if not check fuel filter if its clogged if not-check the in tank pick-up sock if okay -then replace fuel pump.

See the guides below on testing the fuel pump

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The diagrams below contain pictures and instructions on fuel pump replacement
Let us know if you need anything else
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Friday, February 19th, 2010 AT 4:08 PM
Tiny
MATTYGW
  • MEMBER
Where is the fuel pump? In the tank or not?
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Friday, February 19th, 2010 AT 4:10 PM
Tiny
MATTYGW
  • MEMBER
Fuel pump doesn't come on. Could it be a fuse blown to the fuel pump?
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Friday, February 19th, 2010 AT 4:23 PM
Tiny
DAVID WILLIAMS2
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 175,890 MILES
I cannot locate the fuel pump.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
It is inside the fuel tank and the tank has to be removed to access it.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 210,000 MILES
My 93 grand prix started idling erratically. I changed the plugs and wires, that didn't help. Then I checked the fuel pressure: I hooked up the pressure gauge and turned the ignition switch on. The pressure went up to around 45 psi (which is where it is supposed to be) but then dropped slowly all the way down to zero after the fuel pump stops running. It is supposed to hold steady. Does that mean I need a new fuel pump
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi jkaseno,

Thank you for the donation.

Is vehicle equipped with Throttle Body Injection (TBI) or Programmed Fuel Injection (PFI)?

For TBI system the pressure would dissipate after a short while.

Do you mean the idling speed is surging?
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+1
Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
Well im not sure what you mean by surging it goes rrRRRrrr. RrrRRRRrrrr. RrrRRRrrr. And shakes, and stinky exhaust cloud when you rev the engine. It barely idles
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
Yea, the idling speed seems like its gonna die, it goes down almost to zero then like its trying to fix it self it revs up a little, then drops again at a constant pace rrRRrr. RrrRRRrrrr. RrrRRRrrrr
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Yes, surging is the term we normally use for such conditions.

Problem is due to erratic idling speed. When this occurs, the PCM would try to compensate and the idle would surge.

Possible causes are
1. Low idling speed. Air passage restriction would reduce the idling speed. Cleaning the throttle body and idle valve should help if there are no other faults.
2. Misfiring. If the engine is not running correctly due to bad spark plugs or related parts, the the idling speed would drop.
3. Vacumn leakages. If any vacumn leakage occurs between the MAF and throttle body, idle would be erratic.

Is the Check Engine Lamp indicating?
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
No the check engine light is not on when its running. I did replace the plugs and wires right away and that didn't help much
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
As the idling speed is low, get the throttle body cleaned and retest.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
SAMTY25
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
Engine Mechanical problem
1993 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic

I wanted to know where the fuel off whitch was on my 1993 pontiac grand prix. I ran out of gas. Put gas in, and didn't start at all. I got told it was my fuel pump. I need to know where it is if someone could tell me I would greatly like that!
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
You need to replace the fuel pump
Fuel pump is located in the fuel tank
drop down the tank and replace pump
good luck

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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
Im not sure how to tell if my car is throttle body injection or port fuel injection, it does have a schrader valve, and in my haynes manual that suggests it is port fuel injection
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
TBI means there are no individual injectors. You have part that looks like a carburettor.

PFI has individual injectors for each cylinder.

From the description, it should be PFI.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
So that brings us back to the beginning, the fuel pressure dropped after the pump stopped running when I did a fuel pressure test. On a PFI that is not supposed to happen. What does that mean?
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
That could mean a faulty pressure regulator, fuel pump or leakage in the fuel delivery lines.

Clamp the return hose and test if the pressure drops after fuel pump stops running. If yes, check the fuellines for leakges. If none found, you need to remove the fuel pump to check the hoses between fuel pump and housing out of tank.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
JKASENO
  • MEMBER
I inspected the lines and there is no smell of gas or any signs of a leak. So its probably the regulator or the fuel pump. One last question, is there a way I can eliminate one of the possibilities?
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
The pressure test outlined in previous post would eliminate the pressure regulator if the pressure drops with the return fuel line clamped.
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Thursday, October 4th, 2018 AT 6:04 PM (Merged)

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