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.
Fuel Delivery
On LTD and Marquis models, low pressure electric fuel pump in tank delivers pressurized fuel to inlet port on high pressure pump. High pressure pump is used to deliver fuel to injectors in fuel charging assembly.
On all other models, fuel is delivered from fuel tank by high pressure electric fuel pump, which is mounted in fuel tank. Fuel is filtered and sent to fuel charging assembly.
Both injector nozzles are mounted vertically above throttle plates, in parallel with fuel pressure regulator. Fuel pressure regulator keeps fuel delivery pressure at constant 39 psi (2.7 kg/cm2 ). Excess fuel, supplied by pump but not needed by engine, returns to tank through fuel return line.
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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.