Fuel Pressure
NOTE:
Constant fuel pressure is maintained in fuel lines and component parts at all times. Relieve pressure before attempting to open system for testing. Do not allow fuel to flow onto engine or electrical parts or allow an open flame in area while testing fuel system components.
- Disconnect negative battery cable. Unplug cold start injector electrical connector. Place container under fuel rail at union bolt of cold start injector hose.
- Remove union bolt and drain fuel rail. Remove cold start injector hose from union bolt and install fuel pressure gauge with hose to union bolt. Install gauge and bolt to fuel rail with a gasket on each side of gauge fitting.
- Connect battery cable and start engine. Disconnect vacuum line from fuel pressure regulator and pinch line closed. Gauge reading should be 33-38 psi (2.3-2.7 kg/cm2 ). If pressure is too high, replace fuel pressure regulator; if too low, check fuel system for leaks.
- Connect vacuum line to pressure regulator. Pressure reading should decrease to 28 psi (2.0 kg/cm2 ) with engine at idle speed. If not, replace fuel pressure regulator. Stop engine. If pressure drops quickly, check fuel pump, pressure regulator, and injectors.