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.
   Fig 1: Measuring Inner Diameter Of High Pressure Fuel Pump Case Bore Using Caliper Gauge

   Courtesy 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.
   Fig 2: Calculating Clearance Between Fuel Pump Lifter And High Pressure Fuel Pump Case Bore

   Courtesy 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)