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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 191 (Fuel System (CUMMINS 5.0L)) >> Basic Inspection >> Fuel System >> Low-Pressure System Check >> Measurement - Engine Will Start

Measurement - Engine Will Start

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
  1. This part of the procedure is for measuring the low pressure system for an engine that will start.
    GNSALBIA2278Z-278Courtesy of NISSAN NORTH AMERICA, INC.
    • Check for air in the fuel with engine running at idle.
      • Check for air in the fuel in the Tool (A) between the fuel supply line and the Stage 1 fuel filter inlet.
      • Check for air in the fuel in the Tool (A) between the Stage 1 fuel filter outlet and the fuel supply line.
    • There should not be any air present.

      Tool

      :-- - (J-54420)
  2. Refer to the appropriate troubleshooting tree for repair direction.
    NOTE: If air in the fuel is not present before the Stage 1 fuel filter, but present at the outlet of the Stage 1 fuel filter, this indicates air is being ingested at the inlet connection to the Stage 1 fuel filter or the Stage 1 fuel filter.
  3. Measure inlet restriction with the engine running at low idle.

    Maximum fuel inlet restriction at idle

    : 20 kPa (0.204 kg/cm 2 , 2.9 psi)
  4. Measure drain line restriction with the engine running at low idle.

    Maximum drain line restriction at idle

    : 100 kPa (1.02 kg/cm 2 , 14.5 psi)
  5. Measure the fuel filter restriction with the engine running at low idle.
    • Record the fuel pressure at the inlet of the Stage 2 fuel filter from the fuel pressure gauge or multimeter.
    • Record the fuel pressure at the outlet of the Stage 2 fuel filter through CONSULT (Fuel Supply Pressure).
    • The fuel pressure reading in CONSULT is in absolute pressure. Make sure the ambient pressure is subtracted from the CONSULT reading so that the pressures are in gage.
    • Subtract the inlet reading from the outlet reading to determine the fuel filter restriction.

      Maximum pressure drop across fuel filter

      : 34 kPa (0.35 kg/cm 2 , 4.9 psi)
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