Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYFUEL SYSTEM - GENERAL INFORMATIONDESCRIPTION AND OPERATIONFUEL SYSTEMNOTES
2010 Mercury Mariner Hybrid, AWD
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.