Fuel System - Overview

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Overview

NOTE: Repairs of the fuel system are to be achieved only by replacement of the failed component (s). Repair of a fuel system component should not be attempted.

NOTE: If directed during assembly of fuel system components, lubricate any seal(s) only with specified material. Failure to follow this instruction may result in seal failure and fuel leakage.

The fuel system consists of:

a Closed Loop Pressure Control (CLPC) system.
fuel and vapor lines in an integrated bundle assembly.
uses a single container fuel tank.
has a high pressure Fuel Pump that supplies high pressure, low volume fuel pressure to the fuel rails.
quick connect fuel and vapor tube couplings.
a fuel tank filler pipe assembly, which cannot be modified in any way, that also contains a misfuel inhibitor device to permit only unleaded fuel to be pumped into the tank.
has an Easy Fuel™ (capless) fuel tank filler pipe assembly, which cannot be modified in any way and is serviced only by the installation of a new fuel tank filler pipe assembly.
has a supplemental refueling adapter located behind the rear seat.
a Fuel Pump Control Module (FPCM) located on the frame rail above the rear of the Fuel Tank.
- A Fuel Pump (FP) module containing:
the electric FP module which provides pressurized fuel to the high pressure Fuel Pump (FP).
the fuel level sender.
a check valve which maintains system pressure after the pump is shut off.
a pressure relief for overpressure protection in the event of restricted fluid flow.
a lifetime fuel filter providing filtration to protect the fuel injectors from foreign material.

Fuel Pump Shut-off Feature

In the event of a moderate to severe collision, the vehicle is equipped with a Fuel Pump and Sender Shut-off Feature that is initiated by the event notification signal.

The event notification feature provides other vehicle subsystems with information pertaining to restraint system deployment or fuel cutoff status. When an impact occurs which exceeds a predetermined threshold, the RCM sends a signal on a dedicated circuit to the BCM. The BCM then sends a signal on a second hard-wired circuit to the PCM, which initiates fuel cut-off and disables the fuel system.

Should the vehicle shut off after a collision due to this feature, the vehicle may be restarted by first turning the ignition to the OFF position and then turn the ignition to the ON position. In some instances the vehicle may not start the first time and may take one additional ignition cycle.