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 - All Others
The internal components of the fuel conditioning module include the following:
- 10 micron fuel filter and water separator
- water in fuel (WIF) sensor
- recirculation thermostat
The fuel pump (FP) assembly draws fuel under vacuum through the fuel conditioning module through the fuel tank supply and return lines. When the fuel enters the fuel conditioning module, water is separated from the fuel before it flows through the 10 micron fuel filter which separates particles from the fuel. The separated water collects at the bottom of the filter housing. If enough water is collected, the WIF sensor detects it and the PCM illuminates the WIF indicator. The conditioned fuel returns to the FP assembly. The FP delivers the conditioned fuel to the secondary fuel filter assembly to supply the high pressure fuel injection pump.
The vented fuel from the fuel pressure control valve returns from the high pressure fuel injection pump, combines with the fuel from the fuel injector return line and enters the unfiltered side of the fuel conditioning module. Depending on the fuel temperature returning from the high pressure fuel injection pump, the recirculation thermostat directs the fuel back to the fuel tank or through the fuel conditioning module back to the high pressure fuel injection pump.
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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.