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How do you know if fuel pressure regulator is working correctly on cfsi system 4.3

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You need an hand gauge to test the fuel pressure regulator.

The fuel pressure regulator sould be placed toward the end of the fuel rail on one side of the injectors

To test it do the following:

Get rid of the fuel pressure in the lines by removing the Fuel Pump fuse and start the engine with fuel pump off. After it stalls, crank it again.Cranking with fuel pump off will release pressure.
Put back the fuse after this.

Connect the Fuel pressure gauge to the side of the pressure regulator, where it gets the fuel in.

Crank the car and check pressure.

I think that at idle, the pressure should be about:
235kPa - 2.4 kg/cm2 - 34 psi.

The data is not exact, it just must be around this values.

If you disconnect the vacuum hose, you will get about:

294 kPa / 3.0 kg/cm2 / 43 psi.

After gthis connect a Hand Vacuum Pump to the pressure regulator and crank the engine. When the vacuum value increases, the fuel pressure must decrease. If this does not happen, then the regulator is faulty and must be replaced.

Regards.

G.

Posted on Jul 31, 2009

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1 Answer

Where is the fuel pressure regulator located on a 2000 Chevy Express 3500 7.4


It's on the return fuel line at the end of the fuel rail. My info says, you have to remove upper intake manifold to get at it. If you have new fuel pressure regulator, you know what it looks like, correct? I couldn't find a good picture. You can look at an online partsbook for that component, rockauto.com usually has a picture.

Make sure no fuel pressure on system before you take anything loose.

Sep 25, 2016 | Chevrolet Express Cars & Trucks

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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

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Will ecu keep fuel pump from working


if the system includes the ecm to give power to a pump relay when required then the ecm will stop the pump working at times when the fuel pressure reaches the regulated pressure
I would be looking else where ,like having a pressure test done on the fuel system to find if relay, pump or regulator/ pressure sensor fault

Apr 22, 2015 | Cars & Trucks

1 Answer

Fuel system on an 05 mustang is a return less system I'm going to turn it to a return and i have some parts fuel regulator,fittings, dual pumps , fuel line. So I'm i going to need a an electronic pump...


why?
ok the returnless system is totally differernt.
the regulator is in the pump and tank,
not knowing the reason, we can not help you,
running 2 pumps, huh? a lift pump and a pusher pump, what?
1: turbo added
2: for fun?
3: dont like loopless.

the stock system has a loop , its just dont leave the tank.
some cars have a mini tank near the fuel rail.
but most use the tank loop.
the pump is regulated then the return goes back to the main gas tank
immediately,.
the OEM Ford and others, puts a fuel pressure sender there.
because there is no vacuum regulator at the rail
the PCM then reads the pressure and adjusts pulse width to the injectors based on load .
The old system used vacuum to control the pressure directly
the new system Does not do that. at all.
there is no vacuum line going to the fuel tank
and at full throttle there is no vacuum at the injector tips
and as such will squirt too much fuel so the regulator drops the pressures about 6 psi. (from idle pressure)
see?
here is what needs to happen.
you just need a pump that works. and is rated for WOT fuel flow.
and the correct pressure set to factory spec, ford, pressure.
how.:
then use any manual regulator to set the pressure spec, pressure.
it never changes, then the stock fuel pressure sensor will report that
and the PCM does all the heavy lifting (calculations by magic)
that is how it works.

not knowing what you are doing so we can get on the same page makes all this impossible.
you are re-engineering the fuel system. so.... need to know that.

Im here,???
i want to go there. where and why.?
go to amazon dot com, type in greg banish books.
bingo read his books, (i have it on NOOK) for cheap.
it covers how loopless works and how it is tuned, to the finest details.

most folks down know why MPI systems drop 6PSI at wot.
it is because the reg is 1:1 reg for each pound of air pressure drop
so does the fuel pressure.
this magic on the old cars, keeps the differential pressure
ACROSS the injector the same at any throttle angle.
you car don't do that. at all. now.

and if you made it do that , id bet the PCM would go quite nuts.
it wants a static pressure. now.

Jun 06, 2014 | Cars & Trucks

1 Answer

What does the fuel pressure have to be on a 1997 dodge intrepid


  1. 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).
  2. 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).
  3. 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.

Nov 12, 2011 | 1997 Dodge Intrepid

1 Answer

I need to replace de fuel presurre sensor in a pontiac montana ,do i have to just replace the sensor ,o the sensor came with the fuel pump?thank you


Replacing the fuel pressure regulator, involves just replacing the regulator at the end of the fuel rail in the engine compartment, but fuel pressure sensor - does this mini-van have a fuel pressure sensor?
replacing the fuel pressure regulator: (1) locate it at the end of the fuel rail in the engine compartment,
(2) relieve fuel system pressure (3) disconnect fuel pressure regulator vacuum line. (4) remove fuel pressure regulator retaining screw (retain for re-use (5) using a shop towel to catch spilled fuel, lift & twist Fuel pressure regulator to remove it from the fuel rail. (6) remove/discard retainer and spacer bracket from the fuel rail. (7) remove fuel pressure regulator from the engine fuel return pipe. (8) remove/discard Fuel Pressure Regulator inlet O-ring (9) Check Fuel Pressure Regulator filter screen for contamination - if contaminated, replace Fuel Pressure Regulator. (10) Lubricate new Fuel Pressure Regulator inlet O-ring with clean engine oil & install onto the Fuel Pressure Regulator inlet. (11) Install the fuel return pipe onto the Fuel Pressure regulator (12) Install new retainer & spacer bracket into the slot on the fuel rail.
(13) Install Fuel Pressure Regulator onto Fuel Rail & tighten Engine Fuel Return Pipe nut to 13 ft-lbs (17 Nm). (14) connect Fuel Pressure Regulator vacuum line, (15) Install Fuel Pressure Regulator attachng screw & tighten to 76 in-lbs (8.5 Nm). (16) Inspect & verify that retainer & spacer bracket is engaged in the slots on the fuel rail. Grasp & pull on the Fuel Pressure Regulator.
to ensure that the Fuel Pressure Regulator is properly seated. (17) inspect for fuel leaks with this
procedure: On 2sec,(holy rollers), off 10sec will be left on, inspect for leaks while running.

Dec 11, 2010 | 2000 Pontiac Montana

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

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

1 Answer

02fordf150 no power p1151 p0174p0305 codes present


p1151 indicates fuel system lean bank 2, p0174 system lean bank 2, p0305 is missfire cylinder number 5. You say no power I take that to mean that is has low power while running, if so with these codes present check your fuel pressure and pressure regulator and fuel pump, it sounds like your fuel system has low pressure and is not responding correctly. Hope this helps, let me know.

Jul 01, 2010 | 2002 Ford F150 Regular Cab

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

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