Ford Full-Size Cars 1968-1988 Repair Guide

Description and Operation


Central Fuel Injection (CFI) is a throttle body injection system in which two fuel injectors are mounted in a common throttle body.

Fuel is supplied from the fuel tank by a high pressure, in-tank fuel pump. The fuel passes through a filter and is sent to the throttle body where a regulator keeps the fuel delivery pressure at a constant 39 psi (265 kPa). The two fuel injectors are mounted vertically above the throttle plates and are connected in line with the fuel pressure regulator. Excess fuel supplied by the pump, but not needed by the engine, is returned to the fuel tank by a steel fuel return line.

The fuel injection system is linked with and controlled by the Electronic Engine Control (EEC) system.