# Water in fuel sensor

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This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article needs more citations. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Water in fuel sensor" – news · newspapers · books · scholar · JSTOR (May 2016) (Learn how and when to remove this message) This article's tone or style may not reflect the encyclopedic tone used on Wikipedia. See Wikipedia's guide to writing better articles for suggestions. (May 2024) (Learn how and when to remove this message) (Learn how and when to remove this message)

A **water in fuel sensor**, or **WiF sensor**, is an electronic [sensor](/source/Sensor) used to indicate the presence of [water](/source/Water) in [fuel](/source/Fuel). It is installed in a [fuel filter](/source/Fuel_filter). When the water level in the water separator reaches the warning level, the WiF sends an electrical signal to the [ECU](/source/Engine_control_unit) or to dashboard (lamp).[1][*[unreliable source?](https://en.wikipedia.org/wiki/Wikipedia:Reliable_sources)*] The WiF is often used in [common rail](/source/Common_rail) engines to avoid [fuel injector](/source/Fuel_injector) damage.[2]

The WiF sensor uses the difference of [electric conductivity](/source/Electric_conductivity) of water compared to diesel and gasoline to determine the presence of water. The WiF sensor can consist of two electrodes that reads the level of resistance in the fluid or between the ground and the electrode.[3]

First generation WiF sensors use a potting resin to isolate the electronic circuit, while the latest generation of WiF sensors (the WS3 sensor in [surface-mount technology](/source/Surface-mount_technology)) are made totally without leakage using an innovative co-molding process.

The latest generation of WiF sensors have a high resistance to vibrations and to thermal excursion cycles.

The main automotive WiF designer and producer is SMP Poland.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## References

1. **[^](#cite_ref-1)** ["Sensors/Water In Fuel Sensor WIF Sensor – KLM Performance"](https://klmperformance.com/collections/sensors-water-in-fuel-sensor-wif-sensor). *klmperformance.com*. Retrieved 2019-11-23.

1. **[^](#cite_ref-2)** Parlatore, Bill (6 May 2013). ["Down The Rabbit Hole: Finding Water In A Fuel Tank"](https://passagemaker.com/technical/down-the-rabbit-hole-finding-water-in-a-fuel-tank/). *PassageMaker*. Retrieved 2019-11-23.

1. **[^](#cite_ref-3)** ["Littelfuse Auto Water in Fuel Sensor Datasheet"](https://www.littelfuse.com/assetdocs/littelfuse-auto-water-in-fuel-sensor-datasheet?assetguid=deb745d1-968b-4704-a67a-77ac4f621cb4). *LittelFuse*. 2018. Retrieved 2025-05-15.

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Adapted from the Wikipedia article [Water in fuel sensor](https://en.wikipedia.org/wiki/Water_in_fuel_sensor) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Water_in_fuel_sensor?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.