Fuel System
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Do not smoke, carry lighted tobacco or have an 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 may result in serious 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 component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
WARNING:
Before working on or disconnecting any of the fuel tubes or fuel system components, relieve the fuel system pressure to prevent accidental spraying of fuel. Fuel in the fuel system remains under high pressure, even when the engine is not running. Failure to follow this instruction may result in serious personal injury.
WARNING:
When handling fuel, always observe fuel handling precautions and be prepared in the event of fuel spillage. Spilled fuel may be ignited by hot vehicle components or other ignition sources. Failure to follow these instructions may result in serious personal injury.
The fuel system consists of:
- a Mechanical Returnless Fuel System (MRFS).
- a fuel rail.
- a fuel rail mounted Schrader valve on all 3.0L engines.
- a Multi-Port Fuel Injection (MFI) system.
- an All-Wheel Drive (AWD) saddle-type or Front Wheel Drive (FWD) standard fuel tank.
- fuel, vapor and brake tubes in an integrated bundle assembly attached to the underside of the vehicle by retaining clips.
- 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 Fuel Pump (FP) module containing:
- an electric FP, which provides pressurized fuel to the fuel rail.
- a fuel level sender.
- a check valve, which maintains system pressure after the FP is shut off.
- a pressure relief valve for overpressure protection in the event of restricted fuel flow.
- an in tank fuel filter providing filtration to protect the fuel injectors from foreign material.
- an individual fuel level sensor, AWD vehicles only.
The FP is controlled by the PCM. Electrical power to the FP is provided through the IFS switch located under the right front door scuff plate.
The engines are equipped with sequential multi-port fuel injection.
The fuel pressure is regulated to a constant pressure by a pressure regulator.