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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 126 (Engine Mechanical (CUMMINS 5.0L) (1 Of 2)) >> Basic Inspection >> Fuel System >> High-Pressure Fuel System Leak Test >> General Information

General Information

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  1. The following procedure contains measurement steps and specifications regarding the engines fuel system components.
    CAUTION: To avoid possible engine and system damage or performance issues:
    • Brush away all dirt and debris from the area prior to opening any fuel, air intake, exhaust, cooling, aftertreatment or other engine system.
    • To avoid contamination, any open engine system ports must be closed immediately with clean care caps or an appropriate covering.
    • Do not allow any debris to fall into the engine.
    • Do not allow any chemical cleaners to enter the engine or any open systems during the cleaning process.
  2. The purpose of this test is to check for leaks from the high-pressure fuel system joints. The High-Pressure Fuel System Leak Test raises rail pressure to 200, 000 kPa (2, 040 kg/cm 2 , 29, 000 psi).
    GNSALBIA2288Z-288Courtesy of NISSAN NORTH AMERICA, INC.

    (1)

    : Fuel rail (bank 1)

    WARNING:
    • The fuel system (fuel pump, high pressure fuel lines, fuel rail, injectors) contain very high pressure fuel. To avoid the risk of personal injury or fire:
      • Do not loosen any fittings while the engine is running.
      • Wait at least 10 minutes after shutting down the engine before loosening any fittings in the high-pressure fuel system to allow pressure to decrease to a lower level.
      • Wear appropriate eye protection and protective equipment as high-pressure fuel spray can penetrate the skin.
      • Never smoke or allow sparks or flames (such as pilot lights, electrical switches, or welding equipment) in the work area. Never allow diesel fuel to spill onto a hot exhaust manifold which can cause a fire.
    • Do not inspect for leaks while the test is running.