P1140 Water In Fuel Condition (Diesel)
What does P1140 mean on a Ford?
P1140 — Water In Fuel Condition (Diesel). This Ford-enhanced code applies to F-250/F-350 Super Duty with Power Stroke diesel.
Common causes of P1140
- Water contamination in the fuel tank
- Infrequently drained filter housing
- Fueling from a contaminated source
- Failed filter element passing water
- Faulty sensor falsely reporting water
How to fix P1140
- Drain the filter housing immediately — water kills injectors
- Replace the fuel filter
- Sample tank fuel for contamination
- Refuel from a trusted high-turnover station
- Verify the sensor reads clear after service