FUEL PRESSURE 1. Visually inspect fuel system, including fuel lines, connections, injectors and electrical connections. Ensure Inertia Fuel Shutoff (IFS) switch is not tripped. Check condition of battery and fuses. Ensure fuel level in tank is sufficient. 2. Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and increase engine speed to 2500 RPM. If engine will not start, cycle ignition switch several times. Measure and record fuel pressure. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to CIRCUIT TEST HC in appropriate article for fuel system diagnosis: Ã For 3.8L, see SELF-DIAGNOSTICS - EEC-V - 3.8L. Ã For 4.6L SOHC, see SELF-DIAGNOSTICS - EEC-V - 4.6L SOHC. Ã For 4.6L DOHC, see SELF-DIAGNOSTICS - EEC-V - 4.6L DOHC. 3. With fuel pressure gauge still installed, cycle ignition switch on and off several times. Record fuel pressure. If fuel pressure is at least 25 psi (172 kPa) after one minute with ignition off, system is capable of maintaining fuel pressure. If fuel pressure is not at least 25 psi after one minute with ignition off, check for leaking fuel injectors or fuel pressure regulator. WARNING: ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. See FUEL PRESSURE RELEASE. Page 1 of 1 BASIC TESTING -1998 Ford Mustang
Spec is 30-45 KOEO(Key on engine off).
Friday, February 27th, 2009 AT 1:17 PM