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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.0L) >> High Pressure Fuel Pump >> Inspection >> Check High-Pressure Fuel Pump Case
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Check High-Pressure Fuel Pump Case

  1. Check that the high-pressure fuel pump case has no deformation, cracks or other damages.
  2. Check the clearance between the fuel pump lifter and high-pressure fuel pump case bore. Check the clearance between fuel pump lifter and high-pressure fuel pump case bore by measuring the outer diameter of fuel pump lifter and the inner diameter of high-pressure fuel pump case bore respectively.
    1. Measure the outer diameter of fuel pump lifter with a micrometer.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • Record the measured value.
      G09479713Courtesy of SUBARU OF AMERICA, INC.
    2. Using a caliper gauge, measure the inner diameter of high-pressure fuel pump case bore.
      NOTE:
      • Measurement should be performed at a temperature of 20°C (68°F).
      • Record the measured value.
      G09479714Courtesy of SUBARU OF AMERICA, INC.
    3. Calculate the clearance between the fuel pump lifter and high-pressure fuel pump case bore. If it is not within the standard, replace the fuel pump lifter and high-pressure fuel pump case as a set.

      Clearance between fuel pump lifter and high-pressure fuel pump case bore: 

      Standard 

      0.065 - 0.134 mm (0.0026 - 0.0053 in)

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