Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Fuel Pressure Regulator

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REMOVAL & INSTALLATION



Fuel injected engines have fuel pumps which produce more pressure than is normally required. A fuel pressure regulator bypasses excess fuel to the fuel tank. A vacuum line (Toyota sometimes calls it a "Vacuum Sensing Hose") applies varying amounts of vacuum to the regulator. As the engine changes speed and load, the vacuum also changes. This allows the pressure regulator to vary the fuel pressure to suit the engine's demands.

1FZ-FE Engine


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Fig. The fuel pressure regulator threads into the fuel rail1FZ-FE engine



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Fig. Install a new O-ring lubricated with a light coat of gasoline1FZ-FE engine



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Fig. The regulator must be properly aligned on the fuel rail1FZ-FE engine

  1. Relieve the fuel system pressure.
  2.  
  3. Disconnect the vacuum line (sensing hose) from the pressure regulator.
  4.  
  5. Wrap a clean shop cloth around the regulator then disconnect the fuel return hose.
  6.  
  7. Loosen the locknut, then remove the regulator. Discard the O-ring.
  8.  

To install:

  1. Fully loosen the locknut on the regulator.
  2.  
  3. Apply a light coat of gasoline to a new O-ring, then install it onto the regulator.
  4.  
  5. Thread the fuel pressure regulator into the fuel rail all the way by hand. Then, turn the regulator counterclockwise until the fuel outlet port faces in the direction proper direction.
  6.  
  7. Tighten the locknut to 18 ft. lbs. (25 Nm).
  8.  
  9. Install the return pipe to the regulator.
  10.  
  11. Connect the vacuum line.
  12.  
  13. Start the engine and check for any fuel leakage.
  14.  

2RZ-FE and 3RZ-FE Engines


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Fig. Fuel pressure regulator arrangement2RZ-FE and 3RZ-FE engines

  1. Relieve the fuel system pressure.
  2.  
  3. Disconnect the vacuum line from the fuel pressure regulator.
  4.  
  5. Carefully, loosen the hose clamp and then remove the fuel return line.
  6.  
  7. With care, loosen the two retaining bolts. Use clean shop cloths to catch spilled fuel as the bolts are loosened.
  8.  
  9. Remove the bolts and separate the fuel pressure regulator from the fuel rail.
  10.  

To install:

  1. Installation is the reverse of the removal process. Use a new O-ring seal. Apply a light coat of gasoline to a new O-ring, and then install it onto the regulator.
  2.  
  3. Tighten the bolts to 78 inch lbs. (8.8 Nm).
  4.  
  5. Start the engine and check for leaks.
  6.  

5VZ-FE Engine
  1. Relieve the fuel system pressure.
  2.  
  3. Remove the air cleaner hose.
  4.  
  5. Remove the intake air connector.
  6.  
  7. Disconnect the fuel return hose from the pressure regulator. Place a clean shop cloth under the regulator to catch any leakage.
  8.  
  9. Remove the bolt holding the engine wiring harness to the left-hand valve cover.
  10.  
  11. Disconnect the protector from the bracket on the right side valve cover, then lift up the engine wiring harness.
  12.  
  13. Remove the two bolts, and then pull out the regulator. Remove and discard the O-ring from the unit.
  14.  



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Fig. Fuel pressure regulator arrangement5VZ-FE engine

To install:

  1. Apply a light coat of gasoline to the new O-ring, then install it on the regulator.
  2.  
  3. Attach the regulator to the left side fuel rail (Toyota calls it a "Delivery Pipe").
  4.  
  5. Check that the pressure regulator rotates smoothly. If it does not, the O-ring may be out of position and causing the problem. Remove the regulator and install a new O-ring.
  6.  
  7. Attach the regulator, then tighten to 71 inch lbs. (8 Nm).
  8.  
  9. Install the engine wire with the bolt.
  10.  
  11. Attach the fuel return hose to the pressure regulator. Be sure to insert the hose up to the stopper and clip it.
  12.  
  13. Install the intake air connector.
  14.  
  15. Install the air cleaner hose.
  16.  
  17. Start the engine and check for leaks.
  18.  

2UZ-FE Engine


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Fig. Fuel pressure regulator arrangement2UZ-FE engine

  1. Relieve the fuel system pressure.
  2.  
  3. Disconnect the vacuum line from the fuel pressure regulator.
  4.  
  5. Carefully loosen the hose clamp and then remove the fuel return line.
  6.  
  7. Carefully remove the two retaining bolts. Use clean shop cloths to catch spilled fuel as the bolts are loosened.
  8.  
  9. Remove the bolts and separate the fuel pressure regulator from the fuel rail.
  10.  

To install:

  1. Installation is the reverse of the removal process. Use a new O-ring seal. Apply a light coat of gasoline to a new O-ring, and then install it onto the regulator.
  2.  
  3. Tighten the bolts to 66 inch lbs. (7.5 Nm).
  4.  
  5. Start the engine and check for leaks.
  6.  

 
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