2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Fuel Pressure Regulator: Installation

  1. INSTALL FUEL PRESSURE REGULATOR ASSEMBLY 
    1. Apply a light coat of gasoline to 2 new O-rings, and install them onto the fuel pressure regulator assembly.
      Fig 1: Identifying Fuel Pressure Regulator Assembly O-Rings
      G04974932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the fuel pressure regulator assembly to the fuel filter.
    3. Attach the 2 claws of the fuel filter and install the cap.
    NOTE:
    • Make sure that the fuel main valve and fuel pressure regulator are not installed backward. If installed backward, the engine may stall.
    • Make sure that the O-rings are not cut or pinched during installation.
      Fig 2: Identifying Fuel Pressure Regulator Assembly And Cap
      G05750001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Attach the claws securely.
  2. INSTALL FUEL MAIN VALVE ASSEMBLY 
    1. Apply a light coat of gasoline to 2 new O-rings, and install them onto the fuel main valve assembly.
      Fig 3: Identifying Fuel Main Valve Assembly O-Rings
      G04974932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the fuel main valve assembly to the fuel filter.
    NOTE:
    • Make sure that the fuel main valve and fuel pressure regulator assembly are not installed backward. If installed backward, the engine may stall.
    • Make sure that the O-rings are not cut or pinched during installation.
      • Fig 4: Identifying Fuel Main Valve Assembly
      G05749999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL FUEL PUMP ASSEMBLY  (See REASSEMBLY )
  4. INSTALL NO. 1 FUEL SUCTION SUPPORT  (See REASSEMBLY )
  5. INSTALL FUEL PUMP HARNESS  (See REASSEMBLY )
  6. TEMPORARILY INSTALL JET PUMP  (See REASSEMBLY )
  7. INSTALL FUEL FILTER  (See REASSEMBLY )
  8. INSTALL FUEL SUCTION PLATE SUB-ASSEMBLY  (See REASSEMBLY )
  9. INSTALL FUEL SENDER GAUGE ASSEMBLY  (See INSTALLATION )
  10. INSTALL FUEL SUCTION WITH PUMP AND GAUGE TUBE ASSEMBLY  (See INSTALLATION )
  11. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
    NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
  12. INSPECT FOR FUEL LEAK  (See ON-VEHICLE INSPECTION )
  13. INSTALL NO. 2 REAR FLOOR SERVICE HOLE COVER  (See INSTALLATION )
  14. INSTALL NO. 3 ROOM PARTITION PAD  (See INSTALLATION )
  15. INSTALL REAR SEAT CUSHION ASSEMBLY  (See INSTALLATION )
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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