Fuel Tank and Lines - Overview

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

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.

Fuel System

The fuel tank and lines consist of:

single container (L-shaped) fuel tank.
Fuel, vapor and brake tubes in an integrated bundle assembly.
Quick connect fuel and vapor tube couplings.
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.

The vehicle:

has a Closed Loop Pressure Control (CLPC) system, which consists of an mechanical returnless fuel system (MRFS).
has a serviceable fuel level sender mounted on the fuel pump module.
has a fuel tank filler pipe which contains a restrictor plate to permit only unleaded fuel to be pumped into the fuel tank.
has an Easy Fuel (capless) fuel tank filler pipe assembly, which cannot be modified in any way.
has a supplemental refueling adapter located in the luggage compartment.
has a lifetime in tank fuel filter serviced as part of the fuel pump.
has fuel tubes (liquid and vapor) combined in a bundle along with the brake tubes mounted on the underside of the floorpan and covered with a protective cover shield.
has quick connect and spring lock fuel tube couplings.

Fuel Pump Shut-off Feature

NOTE: Refer to the Description and Operation, Intelligent Access with Push Button Start. Refer to: Perimeter Anti-Theft Alarm System to review the procedures for achieving the various ignition states (ignition OFF, ignition in ACCESSORY, ignition ON and ignition START) on vehicles with this 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.

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.