Fuel System
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions can result in personal injury.
WARNING:
Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related components. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions can result in personal injury.
The fuel system consists of:
- a fuel rail.
- a multi-port fuel injection (MFI) system.
- a standard fuel tank.
- fuel tubes.
- a fuel filter providing filtration to protect the fuel injectors from foreign material.
- a fuel tank filler pipe assembly, which cannot be modified in any way, that also contains a restrictor plate to permit only unleaded fuel to be pumped into the tank.
- a 1/4 turn-type fuel tank filler cap.
- an inertia fuel shutoff (IFS) switch.
- a bottom mount fuel pump module (FPM) containing:
- the electric fuel pump which provides pressurized fuel to the engine.
- the fuel level sensor.
- an inlet filter.
- a check valve which maintains system pressure after the pump is shut off.
- a pressure relief for overpressure protection in the event of restricted airflow.
The fuel pump is controlled by the powertrain control module (PCM). Electrical power to the pump is provided through the IFS switch located under the right front kick panel.
The engines are equipped with sequential multi-port fuel injection. The PCM is able to maintain constant fuel pressure by varying FPM output. This is accomplished by increasing or decreasing voltage supplied to the tank-mounted FPM.