Question about 1996 Chevrolet Cavalier

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Fuel regulator leaking changed o ring still leaks put on a used one stoped leaking for about a week started leaking again

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Get your fuel pressure tested might be pulseating to hi at times causing seal to blow out??

Posted on Jan 24, 2009

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Does petrol tank leaks when overfilled i fillled up the petrol in Murano 2012 and its started leaking. local mechanics checked the gasket found it missing he replaced it this stoped the leaking for a week...


Yep,breather is necessary.Breather line is draining it under the car,less dangerous.Do not feel it to the top.Replace the draining line,dust/water may find a way into the tank,later u'll have to deal it (fuel filter,cloged fuel lines,fuel pump malfunction,fuel gauge malfunction).Track the problem eliminate the hipoteses of a cracked tank,loosed fuel pump.Cheers.

Oct 26, 2013 | 1989 Volvo 740

1 Answer

Im gonna rplace the fuel pressure regulator. In the haynes manuel it says that you need to remove the fuel rail. Ive asked a few people and they said they dont think it is necassary it is an 03 impala. ...


Not sure why Haynes says to do that. below is instructions from autozone.com, and none of the engines require the fuel rail to come off. That said, if you have the 3.4, you may need to pull the upper intake manifold.


Removal & Installation The need to work as cleanly as possible cannot be over-emphasized. Even the smallest amount of dirt, if allowed into the fuel pressure regulator and/or the fuel rail, will find its way to the fuel injectors. The nozzle openings of the injectors are very small. Keep hands and tools clean. Clean the areas to be disconnected with a suitable solvent. Carefully cover open fittings and connections to keep out foreign material. Dirt in the injectors almost guarantees a clogged fuel injector and engine performance problems.

3.4L (VIN E) Engines

  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure.
  3. Remove the upper intake manifold assembly.
  4. Disconnect the vacuum line from the pressure regulator.
  5. Remove the regulator retaining screw and remove the retainer bracket. Using a clean shop cloth to catch fuel spillage, carefully pull the regulator from the fuel rail. Twist the regulator slightly while removing to ease removal. Discard the O-ring.

    0996b43f802307fd.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Exploded view of the fuel pressure regulator mounting-3.4L (VIN E) engines


To install:
  1. Clean all parts well. DO NOT use shop compressed air to test or clean a fuel pressure regulator. Clean the fuel pressure regulator screen, if necessary. DO NOT immerse the fuel pressure regulator in a solvent bath or it will be damaged.
  2. If the filter screen has been contaminated, it should be removed and the pressure regulator replaced.
  3. Lubricate a new pressure regulator O-ring with clean engine oil and install on the regulator inlet.
  4. Install the fuel return pipe to the regulator.
  5. Install a new retainer and spacer bracket into the slot on the fuel rail and install the pressure regulator to the fuel rail. Tighten the fuel return line nut to 13 ft. lbs. (17 Nm).
  6. Connect the vacuum line to the pressure regulator and install the retainer screw. Tighten to 76 inch lbs. (8.5 Nm).
  7. Inspect and verify that the retainer and spacer bracket is engaged in the slots in the fuel rail. Grasp and pull on the regulator to ensure that it is properly seated.
  8. Install the upper intake manifold.
  9. Connect the negative battery cable.
  10. Inspect for leaks using the following procedure:
    1. Turn the ignition switch to the ON position for 2 seconds.
    2. Turn the ignition switch to the OFF position for 10 seconds.
    3. Turn the ignition switch to the ON position again.
    4. Inspect all areas for fuel leaks.

3.8L Engines
  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure.
  3. Clean any dirt from the fuel pressure regulator retaining ring.
  4. Remove the vacuum hose from the pressure regulator.
  5. Remove the snaprings. Twist the regulator slightly and pull the pressure regulator from the fuel rail. Use a shop towel to catch fuel spillage as the regulator is removed.
  6. Remove the O-rings and O-ring back-up.

To install:
  1. Clean all parts well. DO NOT use shop compressed air to test or clean a fuel pressure regulator. Clean the fuel pressure regulator screen, if necessary. DO NOT immerse the fuel pressure regulator in a solvent bath or it will be damaged.
  2. If the filter screen has been contaminated, it should be removed and the pressure regulator replaced.
  3. Lubricate the new pressure regulator O-rings with clean engine oil. Install the O-ring back-up, the large O-ring and then the small O-ring. Install the pressure regulator and secure with the snapring.
  4. Attach the vacuum hose.
  5. Connect the negative battery cable.
  6. Inspect for leaks using the following procedure:
    1. Turn the ignition switch to the ON position for 2 seconds.
    2. Turn the ignition switch to the OFF position for 10 seconds.
    3. Turn the ignition switch to the ON position again.
    4. Inspect all areas for fuel leaks.

  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure.
  3. Clean any dirt from the fuel pressure regulator retaining ring.
  4. Remove the vacuum hose from the pressure regulator.
  5. Remove the snaprings. Twist the regulator slightly and pull the pressure regulator from the fuel rail. Use a shop towel to catch fuel spillage as the regulator is removed.
  6. Remove the O-rings and O-ring back-up.

To install:
  1. Clean all parts well. DO NOT use shop compressed air to test or clean a fuel pressure regulator. Clean the fuel pressure regulator screen, if necessary. DO NOT immerse the fuel pressure regulator in a solvent bath or it will be damaged.
  2. If the filter screen has been contaminated, it should be removed and the pressure regulator replaced.
  3. Lubricate the new pressure regulator O-rings with clean engine oil. Install the O-ring back-up, the large O-ring and then the small O-ring. Install the pressure regulator and secure with the snapring.
  4. Attach the vacuum hose.
  5. Connect the negative battery cable.
  6. Inspect for leaks using the following procedure:
    1. Turn the ignition switch to the ON position for 2 seconds.
    2. Turn the ignition switch to the OFF position for 10 seconds.
    3. Turn the ignition switch to the ON position again.
    4. Inspect all areas for fuel leaks.

Mar 16, 2011 | 2003 Chevrolet Impala

1 Answer

Need step by step inst. to replace fuel pressure reg.


  1. First, you will need to depressurize your fuel system. Remove the Fuel Pump Relay, start the vehicle and run until it shuts off, should only take a few seconds.
  2. The Fuel Pressure Regulator is held in place on the Fuel Rail using a Retaining Ring, or Snap Ring.
  3. You will need to remove the Vacuum Hose connected to the Fuel Pressure Regulator before you remove the retaining ring.
  4. You need a pair of Snap Ring Pliers to remove this retaining ring.
  5. Once the retaining ring is removed, slide the old Fuel Pressure Regulator out, and install the new one. Lubricate the O rings on the new part and the fuel line before assembly.
  6. After reinserting the Snap Ring, ensure that it is snapped in place completely.
  7. Reinstall the Vacuum hose and reconnect your Fuel Pump Relay. Turn the Ignition to On, and check for leaks around the Fuel Pressure Regulator.
  8. If no leaks are found, proceed to start the vehicle.

Mar 15, 2011 | 1998 GMC Jimmy

1 Answer

If i put a little gas in the carberator and fight with my blazer it will start and stay started, but if i leave it for awhile, it will turn over but not start. i cant figure out if it is electric or...


Get a fuel pressure gauge and connect it to the rail for the fuel injectors to read pressure.

If the pressure is too low, it might be a bad fuel pressure regulator or pump:

Fuel Pressure Regulator Removal & Installation 2.2L Engine To Remove:
  1. Relieve the pressure in the fuel system.
  2. Disconnect the negative battery cable.
  3. Disconnect the vacuum hose from the fuel pressure regulator.
  4. Remove the pressure regulator mounting screw.
  5. Remove the fuel pressure regulator assembly with O-ring. Inspect filter screen for contamination. If contaminated, remove and discard.
Fuel pressure regulator removal/installation (2.2L SFI engine) gm-05-22-619.gif

To Install:
  1. Apply clean engine oil to the new pressure regulator O-ring and install the O-ring on the regulator.
  2. Install the regulator on the fuel rail. Apply thread-locker to the mounting screw.
    • Tighten the screw to 106 lb in (12Nm).
  3. Connect the negative battery cable.
  4. Use the following procedure to pressurize the fuel system and check for leaks;
  5. Turn the ignition ON for 2 seconds.
  6. Turn the ignition OFF for 10 seconds.
  7. Turn the ignition switch back ON to run the fuel pump again and pressurize the fuel system.
  8. Check the fuel rail assembly for fuel leaks.
4.3L Engine RPO L35 To Remove:
4.3L (RPO L35) Fuel meter body assembly gm_trk_sil15_02-04_43_fuel_metr_body_assy.gif

  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section
  2. Remove or disconnect the following:
    • Upper intake manifold (See: Upper Intake Manifold)
    • Fuel pressure regulator retainer clip (M) and discard the clip
    • Regulator (N) from the housing by twisting and pulling the fuel pressure regulator (N) and using a shop towel to catch any spilled fuel
    • Regulator seal O-ring (R) and discard the O-ring seal
    • Regulator filter (Q) and discard the filter
    • Regulator seal O-ring (P) and discard the O-ring seal
    • Backup ring (O) and discard the ring
  3. Cover the fuel pressure regulator housing to prevent contamination from entering the fuel system
To Install:
4.3L (RPO L35) Fuel meter body assembly gm_trk_sil15_02-04_43_fuel_metr_body_assy.gif

  1. Lubricate the NEW O-ring seals with clean engine oil
  2. Assemble the following new parts to the fuel pressure regulator:
    • Backup ring (O)
    • Regulator seal O-ring (P)
    • Regulator filter (Q)
    • Regulator seal O-ring (R)
  3. Install or connect the following:
    • Fuel pressure regulator with the vacuum tube pointing down
    • Fuel pressure regulator retainer clip (M)
    • Upper manifold
  4. Test drive the vehicle to confirm the repairs
RPO LU3 To Remove:
4.3L (RPO LU3) Fuel meter body assembly gm_trk_sil15_02-04_43_rpolu3_fuel_metr_body_assy.gif

  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section
  2. Remove or disconnect the following:
    • Upper intake manifold
    • Fuel pressure regulator retainer clip (E)
    • Regulator (F) from the housing by twisting and pulling the fuel pressure regulator (F) while using a shop towel to catch any spilled fuel
    • Regulator seal O-ring (J) and discard the O-ring seal
    • Regulator filter (I) and discard the filter
    • Regulator seal O-ring (H) and discard the seal
    • Backup ring (G) and discard the backup ring
  3. Cover the fuel pressure regulator housing to prevent contamination from entering the fuel system
To Install:
4.3L (RPO LU3) Fuel meter body assembly gm_trk_sil15_02-04_43_rpolu3_fuel_metr_body_assy.gif

  1. Lubricate the NEW O-ring seals with clean engine oil.
  2. Assemble the following new parts to the fuel pressure regulator:
    • Backup ring (G)
    • Regulator seal O-ring (H)
    • Regulator filter (I)
    • Regulator seal O-ring (J)
  3. Install or connect the following:
    • Fuel pressure regulator (F) with the vacuum tube pointing down
    • Fuel pressure regulator retainer clip (E)
    • Upper intake manifold
  4. Test drive the vehicle to confirm the repairs
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Nov 04, 2010 | 2002 Chevrolet Blazer

1 Answer

I have a 2004 Tahoe which has misfire problems (P0300). I changed the plugs, wires, fuel filter and air filter but problem still exist. The 4 plugs on the passenger side continue to file out and become...


Removal & Installation of fuel Regulators on
4.8L, 5.3L & 6.0L Engine To Remove:
CAUTION
Three styles of fuel pressure regulators and fuel rails will be used in this model year. Each regulator has a different "footprint" that consequently changes the size of the receiving port in the fuel rail. The regulator retaining clips are specific to each rail-regulator design and cannot be interchanged.
chevy_aval15_02-04_fuelrail.gif

  1. Remove the engine sight shield.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
  3. Clean the fuel pressure regulator retainer and the surrounding area.
  4. Remove or disconnect the following:
    • Fuel pressure regulator vacuum line.
    • Fuel pressure regulator retainer.
    • Fuel pressure regulator.
  5. Remove the following parts from the fuel rail:
    • Backup ring (10)
    • Regulator Seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
To Install:
chevy_aval15_02-04_retainer.gif

  1. Make sure the NEW fuel pressure regulator retainer is the right one.
  2. The tabs (1) are used on the straight vacuum port retainer (2), and the E85-straight vacuum port retainer (3).
  3. The angle vacuum port retainer (4) has no tabs. chevy_aval15_02-04_fuelrail.gif

  4. Install the following parts onto the fuel pressure regulator (9).
    • Backup ring (10)
    • Regulator seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
  5. Lubricate the fuel pressure regulator O-rings with clean oil.
  6. Install the fuel pressure regulator and retainer. CAUTION
    Whenever the fuel pressure regulator is removed from the fuel rail NEW O-rings and a NEW retaining clip should be used on reinstallation.
  7. Connect the vacuum line.
  8. Tighten the fuel filler cap.
  9. Use the following to inspect for leaks:
    • Turn ON the ignition, with the engine OFF, for 2 seconds.
    • Turn OFF the ignition for 10 seconds.
    • Turn ON the ignition, with the engine OFF.
    • Install the engine sight shield.
8.1L Engine To Remove:
Fuel pressure regulator vacuum line gm_trk_sub15_fuel_press_reg_vac_line.gif

  1. Before servicing the vehicle refer to the precautions at the beginning of thjs section
  2. Remove the fuel injector sight shield as needed
  3. Relieve fuel system pressure (See: Fuel Pressure Relieving)
  4. Disconnect the fuel pressure regulator vacuum line (A) 8.1L Fuel pressure regulator retainers gm_trk_sub15_81l_fuel_press_reg_retainers.gif

  5. Clean any dirt from the fuel pressure regulator retainer and the surrounding area
  6. Remove the fuel pressure regulator retainer (I)
  7. Remove the fuel pressure regulator (H) from the fuel pressure regulator housing
To Install:
8.1L Fuel pressure regulator retainers gm_trk_sub15_81l_fuel_press_reg_retainers.gif

  1. Install or connect the following:
    • Backup ring (J) on the fuel pressure regulator (H)
    • New large O-Ring (K) on the fuel pressure regulator
    • Regulator filter (L) on the fuel pressure regulator
    • New small O-Ring (M) on the fuel pressure regulator
  2. Lubricate the fuel pressure regulator large O-Ring and the small O-Ring with clean engine oil
  3. Push the fuel pressure regulator onto the regulator housing on the fuel rail
  4. Install a new fuel pressure regulator retainer (I)
  5. Install or connect the following:
    • Fuel pressure regulator vacuum line
    • Negative battery cable
  6. Tighten the fuel filler cap
  7. Inspect for leaks using the following procedure:
    • Turn on the ignition with the engine off for two seconds
    • Turn off the ignition for 10 seconds
    • Turn on the ignition with the engine off
    • Inspect for fuel leaks
  8. Install the fuel injector sight shield
  9. Road test the vehicle to check performance
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Sep 02, 2010 | Chevrolet Tahoe Cars & Trucks

2 Answers

Have 1998 safari 4.6 throttle body cannot find fuel pressure regulator


Astro, Safari 1997-2005

Fuel Pressure Regulator - Removal & Installation
  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure. Refer to the fuel system relief procedure in this section.
  3. Remove the upper manifold assembly.
  4. Remove the fuel pressure regulator vacuum tube.
  5. Disassemble the fuel pressure regulator snapring retainer.
  6. Remove the fuel pressure regulator assembly and the O-rings. Discard the O-rings, filter and back-up O-rings.

    5d30462.jpg
    Fig. The fuel pressure regulator is retained by this clip


    913de3d.jpg
    Fig. Replace the O-rings whenever the fuel pressure regulator is removed
To install:
  1. Lubricate the O-rings with clean engine oil and install as an assembly.
  2. Install the fuel pressure regulator, attach the vacuum tube.
  3. Install the snapring retainer.
  4. Install the upper manifold assembly.
  5. Connect the negative battery cable.

  1. Relieve the fuel system pressure.
  2. Remove the upper intake manifold assembly.
  3. Remove the fuel pressure regulator retainer clip (5).
  4. Pull and twist the fuel pressure regulator (6) in order to remove the fuel pressure regulator from the fuel pressure regulator housing using a shop towel to catch any spilled fuel.
  5. Remove the regulator seal lower O-ring (3).
  6. Remove the regulator assembly filter (2).
  7. Remove the regulator seal upper O-ring (1).
  8. Remove the regulator seal backup ring (7).
  9. Discard the O-rings.

    a29bed6.jpg
    Fig. Exploded view of throttle body assembly (click for zoom)
To install:

NOTE If the fuel pressure regulator is to be reinstalled, inspect the filter screen for contamination. If the filter screen is contaminated, replace the regulator.
  1. Lubricate the new O-rings with clean engine oil.
  2. Install the regulator seal backup ring (7).
  3. Install the regulator seal upper O-ring (1).
  4. Install the regulator assembly filter (2).
  5. Install the regulator seal lower O-ring (3).
  6. Assemble the regulator (6) with the vacuum tube pointing down into the regulator retainer clip.
  7. Install the fuel pressure regulator retainer clip (5).
  8. Install the upper manifold assembly.
  9. Connect the negative battery cable.
  10. Inspect for leaks.
    1. Turn the ignition ON , with the engine OFF , for 2 seconds.
    2. Turn the ignition OFF for 10 seconds.
    3. Turn the ignition ON , with the engine OFF .
    4. Inspect for fuel leaks.
  11. Install the engine cover.

Hope helps with this (remember comment and rated this).

Aug 05, 2010 | GMC Safari Cars & Trucks

1 Answer

I WAS WORKING ON GRAND AM GT 3.4L GT. I REPLACE THE HEAD GASKETS AND REPAIR 2 CYLINDER ROCKER ARM TORQUE EVERYTHING AND REINSTALL ALL THE PARTS. I RUN THE ENGINE FILL THE COOLANT AND BLEED IT WORKS VERY...


The manual is very specific about instillation of the presure regulator. All of the o rings need to be replaced, and the pressure regulator mounting screw should be the very last thing you tighten or else leaks will develop. Also coat the o rings with engine oil before assembly

Jan 14, 2010 | 2000 Pontiac Grand Am GT

1 Answer

1998 diesel freelader is pinking


You have a leak somewhere that is letting the fuel system **** in air. This is serious and needs to be taken care of immediately. Check all your lines and fittings for wet spots or signs of fuel leaking and repair. Also double check to make sure your new filter is on tight and no fittings have been put on crossthreaded. Hope this helps.

Nov 01, 2009 | Land Rover Freelander Cars & Trucks

3 Answers

I changed the 2 fuel filters the truck ran for 2 mins. than stoped I was wondering if i had to prime the system.


No priming. It will do it by itself. It may take 4 or 5 cranks and runs before it reaches fuel regulator. If not, you may have a leak or a faulty regulator

Sep 09, 2009 | Ford F-350 Cars & Trucks

2 Answers

A/c blows hot even after i have put in freon.


Most likely the additional charge you added leaked out overnight, these systems are very prone to leaks in 2 area's, the AC condensor core and the line O ring seals.

Nov 11, 2008 | 2000 Ford Explorer

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