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Fuel Pump Pressure Test

  1. Turn ignition off. Ensure A/C is off (if equipped). Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Attach Fuel Pressure Gauge Set (J-34730-1) to fuel rail or fuel supply line. See Figure. Turn ignition on. Allow fuel pump to run for about 2 seconds. Check fuel pressure. See FUEL PUMP PERFORMANCE  table under FUEL SYSTEM DIAGNOSIS.
  2. With engine at normal operating temperature, turn ignition on and let fuel pressure build to maximum pressure. Start engine and observe pressure. See FUEL PUMP PERFORMANCE  table. If pressure drop is as specified, system is operating properly. If pressure does not drop as specified, see appropriate FUEL SYSTEM DIAGNOSIS  procedure. Locate and repair leak or restriction in fuel system.
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