Question about 1995 Dodge Dakota

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How do you test a fuel pressure regulator - 1995 Dodge Dakota

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Remove the vacuum hose,while observing the fuel pressure on a gauge

Posted on Oct 15, 2010

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How do you know if your air &gas regulator on honda accord 2002 ex is working ?????


If you mean the fuel pressure regulator, you do a fuel pressure test. That checks the fuel pump, fuel filter, and the pressure regulator. Rent or borrow a fuel pressure gauge, hook it onto the test port, turn key on, and read the pressure. With engine running, read it again, it may drop a few psi which is normal. Here is a how to: http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

May 13, 2015 | 2002 Honda Accord

1 Answer

No fuel injection spray on a 94 s 10


I would first do a fuel pressure test first to determine if the fuel is indeed doing its job. 4cyl. could be bad injector, 6 cyl has spider injector assembly and fuel pressure regulator which I would check the fuel pressure regulator after the fuel pressure test.

Jul 17, 2014 | Cars & Trucks

2 Answers

Fuel pressure 1998 jeep grand cherokee 4.0 L V6


You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
  1. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to test port pressure fitting on fuel rail (Fig. 7).
  2. Remove vacuum line from pressure regulator.
  3. Start the vehicle.
  4. Note gauge reading. With vacuum line disconnected, fuel pressure should be approximately 269 kPa (39 psi).
  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
  7. If fuel pressure is low, momentarily pinch shut the hose section of the fuel return line. If fuel pressure remains low, inspect the fuel supply line, fuel filter, and fuel rail inlet for blockage. If fuel pressure rises replace fuel pressure regulator.
  8. If fuel pressure is above specifications, inspect the fuel return line for kinks and blockage.

Capacity Test

  1. Remove the cap from the pressure test port in the fuel rail.
  2. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to the pressure fitting on the fuel rail (Fig. 7).
  3. Start the vehicle. Pressure should be approxi- mately 214 kPa (31 psi) with the vacuum hose connected to the pressure regulator and 269 kPa (39 psi) with the vacuum hose removed from the pressure regulator.
  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
  • 4a - Inspect the fuel supply and return lines/hoses for kinks or restricting bends
  • 4b - Check the fuel pump flow rate. A good fuel pump will deliver at least 1 liter of fuel per minute with the fuel return line pinched off. If the fuel pump does not pump adequately, then inspect the fuel system for a plugged fuel filter or fuel pump inlet filter (sock). Fuel pump flow rate can be done by connecting one end of an old A/C gauge hose to the fuel test port on the fuel rail and inserting the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank.

May 19, 2014 | 1996 Jeep Grand Cherokee

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 put a new fuel pump in my 97 concorde, it ran just fine all the way home, but in the morning i wouldnt start. i put another pump in and the same thing happend. could this be a short somewhere?


Well, the fuel pump relay may not be getting electricity to the fuel pump.

Also, use the following procedure to test the fuel pump before changing it again:

TESTING Fig. 1: Connect the fuel pressure gauge C4799B or equivalent to the fuel rail service valve - 3.3L shown 88175g09.gif
Fig. 2: Checking the fuel pressure with a gauge - 3.5L shown 88175g10.gif
Fig. 3: Checking the pressure between the pump and the filter 88175g11.gif
Fig. 4: Place the other end of the adapter 6668 into an approved gasoline container 88175g12.gif
  1. Release the fuel system pressure as described in earlier in this section.
  2. Remove the protective cover from the service valve on the fuel rail.
  3. Connect fuel pressure gauge C-4799B or equivalent to the fuel rail service valve.
  4. Place the ignition key in the ON position. Using the DRB III tester or equivalent, access the ASD fuel system test. (The ASD fuel system test will activate the fuel pump and pressurize the system.)
  5. If the gauge reading equals the specifications, then further testing is not required. Without vacuum applied to the regulator, the 3.3L engine fuel system operates at 55 psi (379 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 46 psi (317 kPa). Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa). The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is not correct, record the pressure and remove the gauge.
  6. Ensure that the fuel does not leak from the fuel rail service valve. Install the protective cover onto the fuel rail service valve.
  7. If the fuel pressure reading was below the specifications, test the system according to the following procedure:
    1. Perform the fuel pressure release procedure.
    2. Install a fuel gauge C4799 and fuel adapter 6631 or equivalent in the fuel supply line between the tank and the fuel filter.
    3. Using the DRB III scan tool or equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  8. If the pressure is at least 5 psi (1 kPa) or higher than the reading recorded, replace the fuel filter.
  9. If no change is observed, gently squeeze the return hose. If the pressure increases, replace the pressure regulator. If the gauge reading does not change when the return hose is squeezed, the problem is either a plugged inlet strainer or defective fuel pump.
  10. If the fuel pressure reading was above the specifications test the system according to the following procedure:
    1. Perform the pressure release procedure.
    2. Install fuel pressure gauge C4799 and adapter 6631 or equivalent in the fuel supply line between the fuel tank and the fuel filter.
    3. Remove the fuel return line hose from the pump at the tank. Connect pressure test adapter 6668 or equivalent to the return line. Place the other end of adapter 6668 into an approved gasoline container. A minimum of 2 gallon tank should be sufficient. All return fuel will flow into the container.
    4. Using the DRB III scan tool or its equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  11. If the pressure is now correct, replace the fuel pump.
  12. If the pressure is still above specifications, remove the fuel return hose from the chassis fuel tubes (at the engine) and attach fuel pressure test adapter 6668 or equivalent to the return tube. Place the other end of the hose in the clean container, repeat the test. If the pressure is now correct, check for a restricted fuel return line. If there is no change observed, replace the fuel pressure regulator.
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Oct 08, 2010 | 1997 Chrysler Concorde

2 Answers

Locating fuel pressure regulator


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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Aug 05, 2010 | 2001 Chevrolet Blazer

3 Answers

2000 Malibu Starts then looses fuel pressure I have replaced the fuel pump and the fuel pump relay still same problem


Keep in mind that you have several components there:
- Fuel Pump Sender Assembly,
- Fuel Pressure Regulator,
- Fuel Rail Assembly, and
- Fuel Injectors.

1.- Fuel Pump (Sender Assembly) - TESTING
Refer to the accompanying charts for fuel pump diagnosis and testing.

The fuel injection system remains under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.

eb744a2.jpg

Fig. 3.1L engine OBD system check to be done before fuel pump relay circuit diagnosis


26456ba.jpg

Fig. 3.1L engine fuel pump relay circuit diagnosis (1 of 2)


b3b739d.jpg

Fig. 3.1L engine fuel pump relay circuit diagnosis (2 of 2)


db78a73.jpg

Fig. View of the fuel pressure test port (Schrader valve)-3.1L engine

A - 3.1L engine fuel system pressure test (1 of 4)
B - 3.1L engine fuel system pressure test (2 of 4)
C - 3.1L engine fuel system pressure test (3 of 4)
D - 3.1L engine fuel system pressure test (4 of 4)

c8a9798.jpg

Fig. The fuel pump/fuel sender module assembly is mounted in the fuel tank


2.-
Fuel Pressure Regulator - REMOVAL & INSTALLATION

(the fuel pressure regulator, which is located on the fuel rail assembly)

NOTE:
Before removing the fuel regulator assembly, place a clean shop towel under the regulator to catch any fuel drips

  1. Properly relieve the fuel system pressure.
  2. If not done already, disconnect the negative battery cable.
  3. On the 3.1L engine, remove the intake manifold plenum, as outlined in .
  4. On the 2.4L engine, remove the fuel rail. Refer to procedure earlier in this section.
  5. Detach the vacuum line from the regulator.
  6. Place a shop towel under the regulator to catch any fuel that may drip out. Unfasten the fuel pressure regulator retaining screw, then remove the regulator by twisting and pulling it from the fuel rail.
  7. Remove and discard the O-ring seal. Inspect the filter screen for contamination and replace if necessary.
To install:
  1. Prior to assembling the pressure regulator to the fuel rail, lubricate the new rail-to-regulator O-ring seal with clean engine oil.
  2. Place the O-ring on the pressure regulator and install the pressure regulator to the fuel rail.
  3. Install the retainer or coat the regulator mounting screws with an approved thread locking compound and secure the pressure regulator in place. Tighten the mounting screw to 76 inch lbs. (8.5 Nm).
  4. If removed, install the fuel rail assembly to the engine.
WARNING The fuel return pipe must be connected before tightening the regulator retaining screw to prevent the regulator from rotating. Rotation of the regulator could damage the retainer and spacer bracket and lead to a fuel leak at the regulator inlet.
  1. Connect the fuel feed line and return line to the fuel rail assembly, use a backup wrench on the fittings to prevent turning.
  2. Attach the vacuum line to the regulator.
  3. On the 3.1L engine, install the intake manifold plenum.
  4. Connect the negative battery cable. Turn the ignition to the ON position for two seconds, then turn it to the OFF position for ten seconds. Turn again to the ON position and check for fuel leaks.

continue...

May 24, 2010 | Chevrolet Malibu Cars & Trucks

1 Answer

Trying to find the fuel regulator on a 85 chevy s-10


Fuel Pressure RegulatorREMOVAL & INSTALLATION
(see Figure 1)
  1. Properly relieve the fuel system pressure and disconnect the negative battery cable.
  2. Disengage the vacuum line from the pressure regulator.
  3. If applicable, disengage the fuel line(s) from the regulator.
  4. Remove the retaining bolts, then separate the regulator from the fuel rail assembly.
To install:
  1. Install the regulator to the fuel rail and secure using the retaining bolts.
  2. If applicable, engage the fuel line(s) to the regulator.
e19f467.jpg

Fig. 1: Cross-sectional view of the fuel pressure regulator
  1. Engage the regulator vacuum hose.
  2. Connect the negative battery cable, then pressurize the fuel system by cycling the ignition (without attempting to start the engine) and check for leaks.

To determine if the pump is in good condition, tests for both volume and pressure should be performed. The tests are made with the pump installed, and the engine at normal operating temperature and idle speed. Never replace a fuel pump without first performing these simple tests.
Be sure that the fuel filter has been changed at the specified interval. If in doubt, install a new filter first. The filter is an inexpensive maintenance item and should be replaced if old or suspect. Start the tests with a visual inspection. Check lines for damage, kinks or restrictions. Make sure all fittings are properly tightened and that there is no leakage from the system.

Pressure Test
  1. Disconnect the fuel line from the carburetor and connect a fuel pump pressure gauge.
  2. Start the engine and check the pressure with the engine at idle. If the pump has a vapor return hose, squeeze it off so that an accurate reading can be obtained. Pressure should not be below specification. Most of the carbureted engines covered by this manual are specified between 3-7 psi. Refer to the Tune-Up Specifications chart in Chapter 2 of this manual.
  3. If the pressure is incorrect, replace the pump. It if is OK, perform the volume test.
Volume Test
  1. Disconnect the fuel feed line from the carburetor.
  2. Place the fuel line into a graduated container.
  3. Run the engine at idle until one pint of gasoline has been pumped. One pint should be delivered in 30 seconds or less. There is normally enough fuel in the carburetor float bowl to perform this test, but refill it, if necessary.
  4. If the delivery rate is below the minimum, check the lines for restrictions or leaks. If none are found, replace the pump.

Hope this helped.

Apr 10, 2010 | Chevrolet S 10 Cars & Trucks

4 Answers

Low fuel pressure


U 1st need to test fuel pressure at the fuel pressure test port on the top of the engione in the fuel supply rail to the injector tops, it looks like a metal tire vale stem, u will need to buy a special fuel pressure tester to do this test. U should have around 55-60 PSI at idle, it should go up when u gun the engine but never go down, if it goes down the fuel filter or pump are suspect.

Apr 29, 2009 | 2001 Chevrolet Malibu

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