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Home >> Nissan-Datsun >> 1985 >> 300ZX GL, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Pump - Electric >> Testing >> Pressure Test

Pressure Test

  1. Before disconnecting fuel line, relieve fuel system pressure as follows: Remove relay bracket in engine compartment. Start engine. Unplug harness connector from fuel pump relay. After engine stalls, turn ignition off and plug in connector.
  2. Install Fuel Pressure Gauge (J-25400-34) between fuel filter hose and metal pipe. Start engine and read fuel pressure. Pressure at idle should be 30 psi (2.1 kg/cm2 ). Pressure when accelerator is depressed should be 37 psi (2.6 kg/cm2 ). Replace fuel pump if fuel pressure is below specified value.