2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

High-Pressure Fuel Delivery Pipe Assembly

  1. Install the high-pressure fuel delivery pipe assembly.
    CAUTION:
    • Always use a new high-pressure fuel delivery pipe assembly.
    • Check that the seal surface of the fuel injector pipe have no deformation, cracks or other damages.
    • Check that the seal surface of the fuel injector pipe have no foreign materials.
    1. Temporarily tighten the flare nut (A) to the fuel injector pipe by hand until it is seated, and secure the high-pressure fuel delivery pipe assembly to the water pipe assembly using bolts (B).

      Tightening torque: 

      T1: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

    2. Tighten the flare nuts (A).

      Tightening torque: 

      T2: 25 N.m (2.5 kgf-m, 18.4 ft-lb)

    Fig 1: High-Pressure Fuel Delivery Pipe Assembly Bolts And Flare Nut (With Tightening Torque Specification)
    G00597244Courtesy of SUBARU OF AMERICA, INC.
  2. Install the fuel pipe insulator No. 1, fuel pipe insulator No. 2, fuel pipe insulator No. 3, fuel pipe insulator No. 4 and fuel pipe insulator No. 5. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL INSULATOR>INSTALLATION .
  3. Install the intake manifold assembly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>INTAKE MANIFOLD ASSEMBLY>INSTALLATION .
  4. Connect the battery ground terminal. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
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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.