Induction System

The fuel needed for burning in the cylinders is provided by Sequential Multiport Fuel Injection (SFI).
- Fuel is supplied from the vehicle's fuel tank by a high-pressure electric fuel pump mounted in the fuel tank.
- The fuel is filtered and sent to the fuel injection supply manifold.
- A fuel pressure regulator on this fuel injection supply manifold controls the fuel delivery pressure between 231-269 kPa (33.5-39 psi).
- Fuel is metered into the intake air stream in accordance with engine demand by six solenoid operated fuel injectors mounted in the lower intake manifolds.
- The six fuel injectors are mounted above the intake valves and connected in series 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 and vapor return tube.
- These fuel induction systems are mounted on an aluminum lower intake manifold.