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Fuel pressure

Tiny
COMMANDER_1911
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 121,000 MILES
The car sometimes stalls after starting and when started it runs rough. The fuel gauge will read E to 1/4 of tank when there is more than 1/2 or more fuel in tank. To me it sounds as if there fuel supply problem or maybe water in fuel.
Changed the fuel filter with oem replacement. Checked fuel pressure. The gauge reads 55 psi when dead heads. And 50-52 psi when running. The gauge jumps to 58 psi when engine is running and regulator vacuum is disconnected. Gauge jumps 5 psi with engine running with WOT.
Connected my snap on scan tool. And 2 codes are present P0230 Fuel pump control circuit problem and P1626 Anti-Theft system fuel enable circuit.
Checked connections on fuel pump wiring harness. All are good and NO corroded termials. Any ideas on were the problem/s maybe?
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Monday, April 5th, 2010 AT 11:49 AM

9 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
I think the main problem is with anti-theft system, which will disable FP when activated.

I would reset system according to owners manual.
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Wednesday, April 7th, 2010 AT 9:02 AM
Tiny
MTHALER54
  • MEMBER
  • 2 POSTS
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
I am losing power what should the fuel pressure be? I checked vacumm 19-21" fuel pressure 45-50 psi temp across cat 100 degree rise at idling. Engine runs smooth but not much power to accelerate with.
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
BRYANCFERNANDO
  • MEMBER
  • 11 POSTS
46 psi calls for 52 to 59psi
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
BRYANCFERNANDO
  • MEMBER
  • 11 POSTS
Also if your not getting power off the line it might be your trany.
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
BRYANCFERNANDO
  • MEMBER
  • 11 POSTS
My soulation to not have the power when I needed it was a superchager, and full K&N, with 4inch dual exhust kit kick my porwer out of the roof!
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
BRYANCFERNANDO
  • MEMBER
  • 11 POSTS
Also I found out that if you punch it at around 35 miles an hour it Will yank and go!
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
MTHALER54
  • MEMBER
  • 2 POSTS
It was a clogged catalytic converter
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
LUVNTREVER07
  • MEMBER
  • 1 POST
  • 1996 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 147,000 MILES
Hi, im tyring to see if anyone can help me with my chevy lumina my fuel pressure regulator is leaking and I heard that I got to take the fuel rail off to replace it can you give me step by step directions how to replace it, and if I need to get any gasgets or anything for the parts I take off to replace the regulator because its the only car I got. Thank you.
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Friday, December 18th, 2020 AT 10:25 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Here are the directions:


https://www.2carpros.com/forum/automotive_pictures/249084_regulatorrr_1.jpg



meter body assembly

1.Properly relieve the fuel system pressure. If not already done, disconnect the negative battery cable.
2.Remove the air intake duct (TBI bonnet).
3.Unfasten the 4 pressure regulator retaining screws, while keeping the pressure regulator compressed by maintaining pressure on the regulator cover.

CAUTION
The pressure regulator contains a large spring under heavy compression. Use care when removing the screws to prevent personal injury.

4.Carefully remove the pressure regulator cover, then remove the pressure regulator spring, spring seat and pressure regulator diaphragm assembly.

To prevent leaks, the pressure regulator diaphragm assembly must be replaced whenever the cover is removed.

5.Check the pressure regulator seat in the fuel meter body cavity for pitting, nicks or irregularities. Use a magnifying glass if necessary. If any of the above is present, the whole fuel body casting must be replaced.

To install:

6.Install the new pressure regulator diaphragm assembly making sure it is seated in the groove in the fuel meter body.
7.Install the regulator spring seat and spring into the cover assembly.
8.Position the cover assembly over the diaphragm, while aligning the mounting holes. Be sure to use care while installing the pressure regulator to prevent misalignment of the diaphragm and possible leaks.

Make sure the hold the pressure regulator cover in place to prevent the diaphragm from slipping out of the groove.

9.Coat the 4 regulator retaining bolts with Loctite  262 or equivalent suitable thread sealer, then tighten the screws to 21 inch lbs. (2.4 Nm).
10.Connect the negative battery cable.
11.With the engine OFF , check to see that the accelerator pedal is free by depressing the pedal to the floor, then releasing it.
12.Turn the ignition switch to the ON position for 2 seconds, then turn OFF for 10 seconds. Again turn the switch ON and check for fuel leaks.
13.Install the air intake duct (TBI bonnet) with the gasket.

This is what I was able to access for you. Let me know if it helps.

Joe
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Friday, December 18th, 2020 AT 10:25 AM (Merged)

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