Section 03-01B: Engine, 5.0L and 5.8L MFI | 1996 F-150, F-250, F-350 and Bronco Vehicles Equipped with 5.0L or 5.8L MFI Engines Workshop Manual |
The fuel/air mixture needed for burning in the cylinders is provided by sequential fuel injection (SFI) or multiport fuel injection (MFI).
Fuel is metered into the air intake stream in accordance with engine demand by eight solenoid injection valves mounted in the lower intake manifold (9424).
Fuel is supplied from the vehicle's fuel tank by a high-pressure electric fuel pump (9350) mounted in the fuel tank. The fuel is filtered and sent to the fuel injection supply manifold (9F792). A fuel pressure regulator (9C968) on this fuel injection supply manifold (9D280) controls the fuel delivery pressure at a constant 269 kPa (39 psi). The eight fuel injectors are mounted above each intake runner and are connected in parallel with the fuel pressure regulator. Excess fuel supplied by the fuel pump, but not needed by the engine, is returned to the vehicle fuel tank by a fuel return line.
These fuel induction systems are mounted on an intake manifold which in turn is bolted to cast iron cylinder heads.