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 MANUALSLINCOLN2015MKS BASE, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYFUEL SYSTEM - GENERAL INFORMATIONDESCRIPTION AND OPERATIONFUEL SYSTEM3.7L TI-VCT
2015 Lincoln MKS Base, AWD
3.7L Ti-VCT
2015 Lincoln MKS Base, AWDSECTION 3.7L Ti-VCT
The fuel system:
- is a 2-speed Mechanical Returnless Fuel System (MRFS) with sequential Multi-Port Fuel Injection (MFI).
- uses either a single container (L-shaped) or a dual-container (saddle-type) fuel tank.
- has a fuel level sensor assembly (saddle-type fuel tank).
- has a Fuel Pump (FP) module that supplies fuel under pressure to the fuel rail.
- has a lifetime fuel filter (serviced as part of the FP module).
- has an Easy Fuel β’ (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 in the luggage compartment.
- 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 rear seat backrest.
- has fuel tubes (liquid and vapor) along with brake tubes mounted on the underside of the vehicle in a bundle.
- has a Fuel Tank Pressure (FTP) sensor (part of the fuel vapor tube assembly).
- uses separately controlled fuel injectors for each cylinder. The fuel injectors are mounted to the intake manifold and are supplied with pressurized fuel from the FP module to the fuel rail.
- fuel rail pressure is controlled by the electronic FP module which is enabled by the PCM.
- has a serviceable fuel level sender mounted on the FP module.
- has a serviceable fuel level sender mounted on the fuel level sensor assembly (saddle-type fuel tank).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.