1989 Geo Metro BaseFACTORY OEM SERVICE PROCEDURE

Fuel Pressure Test (Metro)

  1. Relieve fuel system pressure. See FUEL PRESSURE RELEASE. Remove negative battery cable and air cleaner assembly. Remove fuel inlet hose from throttle body and install Fuel Pressure Gauge (J34730-1) with Adapter (J34730-75). See Figure .
  2. Install negative battery cable. Secure air cleaner and start engine. Check for check for leaks and repair if necessary. Allow engine to warm to normal operating temperature.
    NOTE: If engine does not start, disengage fuel pump relay from main fuse box and attach jumper wire between Pink wire of connector and ground. Fuel pump should then operate when ignition switch is turned to the "ON" position.
  3. Measure and record fuel pressure with pump operating and engine off. Fuel pressure should be 23-30 psi (1.6-2.1 kg/cm2 ). Start engine. Measure and record fuel pressure with engine idling. Fuel pressure should be 13.0-20.0 psi (0.9-1.4 kg/cm2 ). Turn key off. Fuel pressure should slowly reduce.
  4. Fuel pressure should maintain 13.0 psi (0.9 kg/cm2 ) for one minute after fuel pump operation stops. If pressure is not within specification, check for defective fuel pump, pressure regulator or restriction in fuel system. Repair as necessary. Repair as necessary and start engine to ensure that no fuel leakage exists.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.