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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.5L) >> Fuel Pump >> Installation
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Fuel Pump: Installation

  1. Install the fuel pump assembly to the fuel tank.
    1. Make sure the sealing portion is free from fuel or foreign matter before installation.
    2. Align the protrusion (A) of the gasket to the position shown in the figure, and install the gasket from the lower side of the fuel pump assembly.
      NOTE: Use a new gasket.
    3. Align the protrusion (C) of fuel pump upper plate cushion with the protrusion (C) of the fuel pump assembly as shown in the figure, and install the fuel pump upper plate cushion from the upper side of the fuel pump assembly.
    4. Align the cut-out of the fuel pump upper plate with the protrusion (C), and install the fuel pump upper plate from the upper side of the fuel pump assembly so that the protrusions (B) (3 places) of the gasket fit the holes of the fuel pump upper plate.
    5. Install the fuel pump assembly to the fuel tank in the direction shown in the figure, and tighten the nuts to the specified torque in the order as shown in the figure.
      CAUTION: Set the arm and float of the fuel level sensor while paying attention to prevent them from contacting the fuel tank. If the arm of the fuel level sensor is bent, the fuel gauge may not read correctly.

      Tightening torque: 

      4.4 N.m (0.4 kgf-m, 3.2 ft-lb)

    Fig 1: Fuel Pump Assembly Nuts Tightening Sequence
    G13640205Courtesy of SUBARU OF AMERICA, INC.
  2. Connect the quick connectors of fuel delivery tube (A), fuel return tube (B), and jet pump tube (C). Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>FUEL DELIVERY, RETURN AND EVAPORATION LINES>INSTALLATION .
    G10264935Courtesy of SUBARU OF AMERICA, INC.
  3. Connect the connector to the fuel pump.
    CAUTION: Before connecting, check that there are no foreign objects, water, etc. in the connectors of the fuel pump and harness. If any foreign objects and water are found, remove them with air blow and completely dry the connectors to connect.
    G10264934Courtesy of SUBARU OF AMERICA, INC.
  4. Install the service hole cover.
    G10264933Courtesy of SUBARU OF AMERICA, INC.
  5. Install the rear seat cushion. Refer to SEATS>REAR SEAT>INSTALLATION .
  6. Connect the battery ground terminal.
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