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.
1999 Chevrolet Cutaway 7.4 JFACTORY OEM SERVICE PROCEDURE
Water-In-Fuel Warning Light
- Fuel manager/filter should be drained every 5000 miles, or when WATER-IN-FUEL warning light comes on. Diesel fuel can damage asphalt and painted surfaces. Always place a drain pan under filter drain hose to collect fuel.
- Stop vehicle and turn engine off. Apply parking brake. Open drain valve. Start and allow engine to idle for 2 minutes or until clear fuel is observed. Turn engine off and close drain valve.
- If WATER-IN-FUEL warning light comes on after fuel manager/filter is purged of water, remove water-in-fuel sensor and wipe tip of sensor clean. Reinstall water-in-fuel sensor. If WATER-IN-FUEL warning light remains on, replace water-in-fuel sensor.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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