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Home >> Subaru >> 2025 >> Legacy Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.5L) >> Fuel Pressure Sensor >> Installation
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Fuel Pressure Sensor: Installation

  1. Prepare for installing the fuel injector using the following new parts. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FUEL INJECTOR>REPLACEMENT .
    • Fuel injector seal
    • Slider washer
    • Back-up ring
    • O-ring seal
    • Stopper ring
  2. Install the fuel injector holder.
    CAUTION: Always use a new fuel injector holder.
    G13223877Courtesy of SUBARU OF AMERICA, INC.
  3. Align the protrusion of the fuel injector holder to the anti-rotation slot of the fuel injector pipe RH, and install the fuel injector straight to the fuel injector pipe RH.
    CAUTION:
    • Always use a new fuel injector pipe RH.
    • Check the inside of the fuel injector insertion hole of the fuel injector pipe for foreign materials or damage.
    • Be careful not to allow gasoline to contact with the fuel injector seal and the inside of the mounting hole.
    • Apply liquid paraffin to the O-ring seal and install it.
    • In order to prevent damaging the O-ring seal, do not install the fuel injector to the fuel injector pipe by tilting or twisting it.
    • Make sure there is no gap between the fuel injector pipe and the fuel injector holder.
    • Make sure there is no gap between the fuel injector and the fuel injector holder.
    G16340526Courtesy of SUBARU OF AMERICA, INC.
    (A) Protrusion portion
    (B) Anti-rotation slot
    (C) No gap allowed.
  4. Insert the fuel injector pipe RH and fuel injector as a single unit into the cylinder head, and align their positions. Then, evenly press the sections (A) and (B).
    CAUTION:
    • When installing, apply liquid paraffin to the fuel injector seal.
    • In order to prevent damaging the O-ring seal, do not install the fuel injector pipe and fuel injector by tilting them toward the cylinder head.
    G13223905Courtesy of SUBARU OF AMERICA, INC.
  5. Tighten the bolts which hold the fuel injector pipe RH.

    Tightening torque: 

    19 N.m (1.9 kgf-m, 14.0 ft-lb)

    G13223906Courtesy of SUBARU OF AMERICA, INC.
  6. Temporarily tighten the fuel pressure sensor until it cannot be turned by hand.
    CAUTION: Always use a new fuel pressure sensor.
  7. Tighten the fuel pressure sensor.
    CAUTION:
    • Be careful not to spill oil on the screw sections of the fuel pressure sensor and the fuel injector pipe RH.
    • Be careful not to let foreign matter enter into the fuel pressure sensor during installation.
    • The sensor should be installed perpendicularly to the fuel pressure sensor's threaded hole of the fuel injector pipe RH, and tightened to the specified torque.
    • Do not recheck the tightening torque after tightening the fuel pressure sensor with specified torque.

    Tightening torque: 

    46 N.m (4.7 kgf-m, 33.9 ft-lb)

    G13223907Courtesy of SUBARU OF AMERICA, INC.
  8. Connect the connector (A) and connector (B).
    G13618439Courtesy of SUBARU OF AMERICA, INC.
  9. Install the high-pressure fuel delivery pipe assembly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>HIGH PRESSURE FUEL DELIVERY PIPE>INSTALLATION>HIGH-PRESSURE FUEL DELIVERY PIPE ASSEMBLY .
  10. Install the air intake boot. Ref. to INTAKE (INDUCTION) (H4DO)>AIR INTAKE BOOT>INSTALLATION .
  11. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
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