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 Conditioning Module: Notes
The internal components of the fuel conditioning module include the following:
- electric fuel pump
- 10 micron fuel filter and water separator
- water in fuel (WIF) sensor
- recirculation thermostat
The electric fuel pump draws fuel from the fuel tank through the 1.27 cm (1/2 inch) fuel supply line. When the fuel enters the fuel conditioning module it flows through the 10 micron fuel filter which separates particles and removes water from the fuel. The separated water collects at the bottom of the pump. If enough water is collected, the WIF sensor detects it and the PCM turns the WIF indicator ON. The conditioned fuel is then delivered to the secondary fuel filter.
The unused fuel returns from the secondary fuel filter through the 0.95 cm (3/8 inch) fuel return port and enters the unfiltered side of the fuel conditioning module. Depending on the fuel temperature returning from the secondary fuel filter, the recirculation thermostat directs the fuel to the fuel tank or through the fuel conditioning module back to the inlet of the primary filter.
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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.