Fuel Pressure
- Depressurize fuel system by disconnecting fuel pump ground lead and cranking engine for a few seconds. Turn ignition switch off and reconnect fuel pump ground lead. Disconnect fuel rail at cold start injector and connect fuel pressure gauge.
- Disconnect negative lead from ignition coil and turn ignition switch on. Pressure reading should be 35.5-37 psi (2.5-2.6 kg/cm2 ). Slow pressure drop is permissible; sudden pressure drop requires check of entire fuel system for leaks. After testing fuel pressure, depressurize fuel system, remove test equipment and reconnect fuel lines and ignition coil negative lead.
- On Jaguar only, operate fuel change-over switch on dash and recheck reading, Reading from both fuel tanks should agree. On all models, if pressure reading is not to specifications, replace fuel pressure regulator.