Fuel System: Notes

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The Mechanical Returnless Fuel System (MRFS) consists of:

a fuel rail.
a saddle-type fuel tank on All-Wheel Drive (AWD) vehicles or an L-shaped fuel tank on Front Wheel Drive (FWD) vehicles.
fuel, vapor and brake tubes in an integrated bundle assembly.
a fuel tank filler pipe assembly, which cannot be modified in any way.
a one-fourth turn-type fuel tank filler cap.
an Inertia Fuel Shutoff (IFS) switch.
a Fuel Pump (FP) module containing:
- the electric FP , which provides pressurized fuel to the fuel rail.
- the fuel level sensor.
- 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.

All vehicles have a fuel level sensor on the FP module. AWD vehicles have an additional fuel level sensor located in the RH side of the fuel tank.

The engines are equipped with sequential MFI injection.

The fuel pressure is regulated to a constant pressure by a fuel pressure regulator.