Fuel System: Notes

2010 Mercury Mariner Hybrid, AWDSECTION Notes

The fuel system consists of the:

  • L-shaped fuel tank.
  • Fuel Pump (FP) module.
  • FP  control module.
  • Easy Fuel™ (capless) fuel tank filler pipe assembly.
  • Inertia Fuel Shutoff (IFS) switch.
  • fuel tubes (liquid and vapor).
  • fuel injectors.
  • fuel rail.
  • Fuel Tank Pressure (FTP) sensor (part of the fuel vapor tube assembly).

The vehicle:

  • uses a 2-speed Mechanical Returnless Fuel System (MRFS).
  • uses a standard (L-shaped) fuel tank.
  • has a FP  module that supplies fuel under pressure to the fuel rail.
  • has a lifetime fuel filter (serviced as part of the FP  module).
  • has a serviceable fuel level sender mounted on the FP  module.
  • has an Easy Fuel TM (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 RR quarter trim access panel.
  • has a FP  module that operates on 10 or 12 volts depending on load, that supplies fuel under pressure to the fuel rail.
  • has a FP  control module located behind the fuel tank, mounted to the underside of the vehicle.
  • has an IFS  switch located behind the RH cowl trim panel.
  • has fuel tubes (liquid and vapor) along with brake tubes mounted on the underside of the vehicle in a bundle.
  • has a FTP  sensor (part of the fuel vapor tube assembly).
  • is equipped with a sequential Multi-Port Fuel Injection (MFI) system.
  • uses separately controlled fuel injectors for each cylinder. The fuel injectors are mounted to the intake manifold.
  • fuel injectors are supplied with pressurized fuel from the FP  module to the fuel rail.
  • fuel injection rail pressure is controlled by the electronic FP  module which is enabled by the PCM.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.