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
The fuel delivery sub-system consists of a low pressure fuel pump mounted in fuel tank, a fuel filter/reservoir and a high pressure electric fuel pump. Pump delivers fuel from fuel tank through a 20 micron fuel filter to a fuel charging manifold assembly. The fuel charging manifold assembly incorporates electrically actuated injectors directly above each engine intake port.
When energized, injectors spray a metered quantity of fuel into intake air stream. On 5.0L engines, a bank of four injectors is energized once every crankshaft revolution, followed by second bank of injectors during next crankshaft revolution. On 2.3L engines, all injectors are energized simultaneously, once per crankshaft revolution.
The length of time that injectors are energized (injector "on time" or "pulse width") is controlled by EEC module. A constant fuel pressure drop is maintained across injector nozzles by a pressure regulator.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.