Where is the fuel regulator

It's fuel pressure regulator .
The fuel pressure regulator attaches to the fuel module assembly. The fuel pressure regulator, located in the fuel tank, is attached to the fuel sender assembly. The fuel pressure regulator keeps the fuel available to the fuel injectors at a regulated pressure

Fuel pressure regulator ! An it's location is inside the fuel tank .
The fuel pump (FP) module contains the fuel pump, fuel pressure regulator and the fuel sender assembly. The fuel pressure regulator is attached to the fuel pump in the fuel pump module located in the fuel tank. It regulates fuel pressure supplied to the fuel injectors. The fuel pressure regulator is a diaphragm-operated relief valve. Fuel pressure is established by a spring preload applied to the diaphragm. Excess fuel is bypassed through the regulator and returned to the fuel tank.

Are you sure its a 5.7L? The didnt make a 5.7L in 2002. what is the 8th, and 10th VIN digit? what is fuel pressure when it runs, and what is pressure when it stalls.? that engine needs 55-62 psi to run. below that it wont.

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.

usually caused by busted diaphram in fuel pressure regulator allowing fuel to be drawn thru regulator directly to intake manifold. Pull vacuum line off regulator, plug line with golf tee, start car and watch to see if gas comes out of regulator. If yes, turn off car, replace regulator. The regulator sits near the fuel rail on the top of the engine as shown below. I will paste replacement instructions below from autozone.com in case you need to replace the regulator. Please let me know if you have any questions.

Removal & Installation

4.2L Engine

1. Relieve the fuel system pressure.
2. Remove the air cleaner outlet resonator.
3. Disconnect the engine wiring harness from the retaining clips at the front of the engine.
4. Disconnect the fuel pressure regulator vacuum line.
5. Clean any dirt from the fuel pressure regulator and the surrounding area.
6. Disconnect the fuel return pipe.
7. Remove the fuel return pipe retainer.
8. Remove the fuel pressure regulator retainer.
9. Remove the fuel pressure regulator.
10. Inspect the regulator filter screen for contamination. If contaminated, replace the fuel pressure regulator.

To install:

1. Install the regulator filter.
2. Install the new O-ring on the fuel pressure regulator.
3. Lubricate the fuel pressure regulator O-ring with clean engine oil.
4. Push the fuel pressure regulator into the regulator housing on the fuel rail.
5. Install the fuel pressure regulator retainer. Tighten the regulator retainer screw to 71 inch lbs. (8 Nm).
6. Install the fuel return pipe retainer. Tighten the return pipe retainer screw to 71 inch lbs. (8 Nm).
7. Connect the fuel return pipe.
8. Connect the fuel pressure regulator vacuum line.
9. Connect the negative battery cable.
10. Inspect for leaks:
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.
    
    
11. Install the engine wiring harness into the retaining clips at the front of the engine.
12. Install the air intake resonator.

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)

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

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

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

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

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

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.

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:

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.
   
   
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

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
   
   
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

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

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.
   
   
   Fig. The fuel pressure regulator is retained by this clip
   
   
   
   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.
   
   
   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.

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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)

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

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

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

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

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

For 2000 Chevrolet Truck Blazer 4WD 4.3L SFI 6cyl
If your engine is a 4.3L V-6 with CPI (central point injection) it is inside the upper intake manifold. The upper intake manifold is bolted on top of the normal intake manifold.

The throttle body is mounted on it and your fuel lines terminate into the center of this.


Removal & Installation

1. Relieve the fuel system pressure.
2. Remove the air cleaner outlet resonator.
3. Disconnect the engine wiring harness from the retaining clips at the front of the engine.
4. Disconnect the fuel pressure regulator vacuum line.
5. Clean any dirt from the fuel pressure regulator and the surrounding area.
6. Disconnect the fuel return pipe.
7. Remove the fuel return pipe retainer.
8. Remove the fuel pressure regulator retainer.
9. Remove the fuel pressure regulator.
10. Inspect the regulator filter screen for contamination. If contaminated, replace the fuel pressure regulator.

To install:



Fig. Fuel pressure regulator-4.2L engine

1. Install the regulator filter.
2. Install the new O-ring on the fuel pressure regulator.
3. Lubricate the fuel pressure regulator O-ring with clean engine oil.
4. Push the fuel pressure regulator into the regulator housing on the fuel rail.
5. Install the fuel pressure regulator retainer. Tighten the regulator retainer screw to 71 inch lbs. (8 Nm).
6. Install the fuel return pipe retainer. Tighten the return pipe retainer screw to 71 inch lbs. (8 Nm).
7. Connect the fuel return pipe.
8. Connect the fuel pressure regulator vacuum line.
9. Connect the negative battery cable.
10. Inspect for leaks:
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.
11. Install the engine wiring harness into the retaining clips at the front of the engine.
12. Install the air intake resonator.

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