Fuel pressure?

Tiny
FRODOE45
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 146,000 MILES
I checked my fuel pressure, key on engine off. Read (48 psi). Haynes manual said 52 to 59, key on engine off. I checked it also with the engine running, it read (40, 42 psi) fluctuating back and forth. I know the car has age. It doesn't seem to fall inspect or does it.
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Wednesday, November 20th, 2019 AT 8:46 AM

25 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
The pressure is a bit low. Have you ever replaced the fuel filter? A dirty filter can cause this to happen. Also, there is a sock at the bottom of the fuel pump assembly that functions as a filter that can also be clogging. And of course, the pump may be going bad.

________________________________________

Here are the directions for replacing the filter. The attached pics correlate with these directions. It's a good place to start especially if it hasn't been done for a long time.

First, here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Here are the directions specific to your vehicle:
________________________________________

2004 Pontiac Grand AM V6-3.4L VIN E
Procedures
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Filter Service and Repair Procedures
PROCEDURES
FUEL FILTER REPLACEMENT

REMOVAL PROCEDURE

IMPORTANT: There is no service interval for fuel filter replacement. Only replace the fuel filter if it is restricted. Inspect the fuel tank internally and clean the fuel tank if you find a restricted fuel filter.

Pic 1

1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
2. Raise the vehicle. Refer to Vehicle Lifting.
3. Disconnect the fuel filter fitting using a back-up wrench.

pic 2

4. Disconnect the quick connect fitting from the fuel filter.
5. Remove the fuel filter.

INSTALLATION PROCEDURE

pic 3

1. Remove the protective caps from the new fuel filter.
2. Install the fuel filter (2) in the same position as the old fuel filter.
3. Connect the fuel filter quick connect fitting.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Connect the fuel filter fitting (3) using a back-up wrench.

Tighten
Tighten the fuel filter fitting to 27 N.m (20 lb ft).

5. Lower the vehicle.
6. Connect the negative battery cable.
7. Inspect for fuel leaks using the following procedure:
7.1. Turn ON the ignition, with the engine OFF for 2 seconds.
7.2. Turn OFF the ignition for 10 seconds.
7.3. Turn ON the ignition, with the engine OFF.
7.4. Inspect for fuel leaks.

_____________________________________

Let me know if that helps. Also, I'm not sure where you are so I can't answer if it has an affect on inspection.

Take care,
Joe
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Wednesday, November 20th, 2019 AT 7:13 PM
Tiny
FRODOE45
  • MEMBER
Thank you. This is very helpful. I have replaced the fuel filter back awhile and pressure regulator. I am considering the pump. Because with the car running it only has in between 40-43 psi. Haynes said there will be a 5 psi decrease under load. Those low 40s' seem too low. I'll keep in touch. Thank you and God bless.
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Thursday, November 21st, 2019 AT 2:42 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If you decide to replace the pump, the tank will need removed. Here are directions for tank removal and replacement. The attached pics correlate with the directions.

_______________________________

2004 Pontiac Grand AM V6-3.4L VIN E
Fuel Tank Replacement
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Tank Service and Repair Removal and Replacement Fuel Tank Replacement
FUEL TANK REPLACEMENT
FUEL TANK REPLACEMENT

REMOVAL PROCEDURE

pic 1

1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
2. Drain the fuel tank. Refer to Fuel Tank Draining Procedure.
3. Raise the vehicle. Refer to Vehicle Lifting.
4. Disconnect the quick-connect fitting at the fuel filter.
5. Disconnect the fuel return pipe quick connect fitting.
6. Remove the rubber exhaust hangers. Allow the exhaust system to rest on the rear axle.
7. Remove the exhaust heat shield.
8. Loosen the fuel filler hose clamp at the fuel tank.
9. Disconnect the fuel filler hose from the fuel tank.
10. Disconnect the evaporative emission (EVAP) vapor pipe from the EVAP canister.

Pic 2

11. Disconnect the electrical harness from the multi-way rear body connector and fuel strap.
12. With the aid of an assistant, support the fuel tank (1).
13. Disconnect the fuel tank retaining straps.
14. Lower the fuel tank.
15. Remove the fuel sender assembly from the tank.

INSTALLATION PROCEDURE

pic 3

1. Install the fuel sender assembly to the fuel tank.
2. With the aid of an assistant, raise the fuel tank (1) to the vehicle.

NOTE: Refer to Fastener Notice in Service Precautions.

3. Install the fuel tank retaining straps.

Tighten
Tighten the strap bolts to 35 N.M (26 lb ft).

4. Connect the wiring harness into the multi-way rear body connector.
5. Connect the EVAP vapor pipe to the EVAP canister.
6. Connect the fuel filler hose to the fuel tank.

Tighten
Tighten the fuel filler hose clamp to 3 N.M (27 lb in).

7. Install the rubber exhaust hangers.
8. Install the exhaust heat shield.

Tighten
- Tighten the exhaust shield bolt to 2 N.M (18 lb in).
- Tighten the exhaust shield nuts to 1 N.M (9 lb in).

9. Connect the fuel return pipe and fuel filter quick-connect fittings.
10. Lower the vehicle.
11. Refill the fuel tank.
12. Install the fuel filler cap.
13. Connect the negative battery cable.
14. Inspect for fuel leaks.
14.1. Turn ON the ignition for 2 seconds.
14.2. Turn OFF the ignition for 10 seconds.
14.3. Turn ON the ignition.
14.4. Inspect for fuel leaks.

__________________________

I hope this helps. Let me know if the pump is the issue.

Joe
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Thursday, November 21st, 2019 AT 2:35 PM
Tiny
CLEZZY
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 88 MILES
On the 2004 Pontiac Grand Am fuel system, do they have a place where fuel pressure can be checked?
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
DOCFIXIT
  • MEMBER
Schrader valve on fuel rail
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
JDL
  • EXPERT
I'd have to look at it. I believe you have to use a special fitting and gage. Note the picture.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
GRANDAMLIZZARD
  • MEMBER
  • 2002 PONTIAC GRAND AM
Engine Mechanical problem
2002 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic

where is the fuel pressure regulator and what is the prssure on this vehicle
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
MASTERTECHTIM
  • MEMBER
Its located in the fuel rail near the throttle body and has a vacuum line going to it. The fuel pressure should be around 40
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
ADAMCW
  • MEMBER
  • 2002 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 129,000 MILES
My wife and I were driving home last night and the car started spitting and sputtering like it was out of gas. Last night the car would crank but would immediately start sputtering and cut off. Today it won't crank at all. It turns over but never starts. I tested the gas pressure port on top of the engine and nothing comes out after I try to start. Does this mean that the fuel pump is bad and if so is this something that a diy mechanic can do. Thanks for any advice.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
BRIAN 1
  • MEMBER
Could be, check the fuel filter and see if it is plugged. If you want to see if the fuel pump is bad, what I do is take the gas cap off and have somebody turn the key on/off and listen for the pump to turn on. If it dosent turn on/off I rap the gas tank with a rubber mallet and see if it starts if it does the pump is bad. Post back with what you find and will advise.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
ADAMCW
  • MEMBER
Thanks. I will try this when I get home from work to day and post results.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
ADAMCW
  • MEMBER
I took a rubber mallet and rapped on the fuel tank while my brother tried to start the car. While I was banging on the passenger side the car wouldn't start. I moved to the other side and the car cranked right up. As soon as I stopped banging the car sputtered and cut off however. Still sound like fuel pump?
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
BRIAN 1
  • MEMBER
Sonunds like it, just to be sure if you can hook up a fuel pressure guage and hit the tank and see if the fuel pressure jumps up, if it does it's a fuel pump. Also when you hit the tank hit it in the middle of the tank thats where the fuel pump is. Plus with the milage on this vehicle and if the pump was never changed it's a good chance the pump failed. Make sure you check of change the fuel filter could also be plugged. Post back with what you find.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
DWENTZ
  • MEMBER
Funny enough, I have a 05 Grand am, V6 with pretty much the exact same milage, 130k, and just a couple days ago the same exact thing happened to me: My wife and I were driving back from IKEA, and right when I was coming home, it started to spew and give out a little bit at a time, like if it was out of gas. The more I hit the accelerator, the worse it got. And like you, the engine would turn, but not start up, and if it did. Roughly, and only for a bit, then die.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
DONNA DAWSON
  • MEMBER
  • 1995 PONTIAC GRAND AM
  • 6 CYL
What should the fuel pressure be on a 95 grand am with a 3100 v6 engine?
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
2CEXPT
  • MEMBER
Fuel System Pressure [1] 40.5 to 47.0 psi

[1]. With engine "OFF", ignition "ON", and the fuel pump running. Fuel system pressure with engine running at idle speed will be lower.
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Wednesday, November 25th, 2020 AT 6:18 PM (Merged)
Tiny
HELLOFUN
  • MEMBER
  • 1990 PONTIAC GRAND AM
My engine cuts out or try to stall it also quits on a hill. The 1990 grand am does not have a fuel presure check gage on throtal body has new fuel filter has been looked @ by too mechanics and they say it does not have one to check fuel presure so how do you check the fuel presure or you have any iddea what the fuel presure gage looks like was told can be checked threw fuel line but u need a speacial addapter to do it with and neather mecanic that have spoke with has it says they almost 200 dollars and pretty much absulete any more so any idea how to check it or what it may look like near or on throtal body
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Wednesday, November 25th, 2020 AT 6:19 PM (Merged)
Tiny
HELLOFUN
  • MEMBER
The 1990 grand am does not have a fuel presure check gage on throtal body has new fuel filter has been looked @ by too mechanics and they say it does not have one to check fuel presure so how do you check the fuel presure or you have any iddea what the fuel presure gage looks like was told can be checked threw fuel line but u need a speacial addapter to do it with and neather mecanic that have spoke with has it says they almost 200 dollars and pretty much absulete any more so any idea how to check it or what it may look like near or on throtal body
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Wednesday, November 25th, 2020 AT 6:19 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
That is correct, you need a T in the fuel line. Check the local parts stores to see if they will lend or rent one to you.
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Wednesday, November 25th, 2020 AT 6:19 PM (Merged)
Tiny
CAROLYN SCHULTZ
  • MEMBER
  • 1988 PONTIAC GRAND AM
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I have excessive fuel pressure will this damage the fuel regulator? I have put on a new fuel pump, a new pressure regulator, new coil pack. The car stills backfires and idles rough when I first start the car. And stalls when driving but starts right back up.
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Wednesday, November 25th, 2020 AT 6:19 PM (Merged)

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