Escort, EXP & Lynx

The Escort, EXP and Lynx models use an externally mounted, high pressure pump. The pump has an internal relief valve calibrated to relieve pressure at 123 psi (8.6 kg/cm² ). Fuel is delivered to the fuel charging manifold assembly which supplies the injectors. Fuel pressure is maintained through a pressure regulator mounted on the fuel rail. All excess fuel is returned by the pressure regulator to the tank.

All injectors are energized simultaneously, once every crankshaft revolution. Engine fuel requirements are satisfied by varying the amount of time that the injectors are left open. This injector "ON" time is determined and controlled by the ECA.

Power to the fuel pump is supplied, through an inertia switch, by a fuel pump relay which is controlled by the ECA. When the ignition switch is "ON", the EEC power relay is energized. The EEC power relay supplies current to the fuel pump relay and a timing device in the ECA. The fuel pump relay and EEC power relay are behind the left side of the instrument panel.

If the ignition switch is not turned to the "CRANK" position within 1 second, the ECA timing device will de-energize the fuel pump relay. This circuit provides for pre-pressurization of the fuel system. When the ignition switch is in the "CRANK" position, the ECA supplies power directly to the fuel pump relay. The ECA will shut off the fuel pump relay if the engine stops or is below 120 RPM.

The inertia switch is designed to open the fuel pump power circuit in the event of a collision. It must be manually reset by pushing the button located on top of the switch. Before resetting, the fuel system should be thoroughly inspected for damage or leaks. The Escort/Lynx inertia switch is located behind the left rear trim panel or inside the left rear shock tower access door on the EXP.