walmartImage: walmartThe Water in Fuel Sensor or WiF sensor indicates the presence of water in the fuel. It is installed in the fuel filter and when the water level in the water separator reaches the warning level,the Wif sends an electrical signal to the ECU or to dashboard (lamp). Water sensor - Wikipedia Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us howPeople also askWhat is a diesel fuel water separator?What is a diesel fuel water separator?A fuel water separator is a device that works to ensure clean fuel is delivered to the engine. Properly speaking,a fuel water separator is a small filtering device used to remove the water from the diesel fuel before it reaches to the sensitive parts of the engine.How Does Fuel Water Separator Work?See all results for this questionHow does a diesel fuel filter work?How does a diesel fuel filter work?Diesel fuel filters usually are made in the shape of a basin or bowl. This means the filter curves down. Water collects in the bottom of the bowl,while an open/close valve at the bottom of the bowl allows the water to drain from the basin,leaving only water. It's important to remember the chemistry of an engine.How Do Diesel Fuel Filters Work? | It Still RunsSee all results for this questionWhat filter is best for my water?What filter is best for my water?The Best Water Filters at Every Price Point LOW. This faucet-mounted water filter has a sleek look,and the price can't be beat.MEDIUM. Undersink water filtration systems may be a little more difficult to install,..HIGH. This serious filter has gained a cult following among clean-water enthusiasts—and..Top 10: The Best Water Filters of 2016 | Apartment TherapySee all results for this questionWhat is a fuel line filter?What is a fuel line filter?Fuel filter. A fuel filter is a filter in the fuel line that screens out dirt and rust particles from the fuel,normally made into cartridges containing a filter paper.What does fuel filter mean? - definitionsSee all results for this question Amazon: water in fuel sensor: Automotive APDTY 015221 Diesel Water In Fuel Sensor with Drain Valve For 6 Duramax Diesel Trucks (Mounts In Bottom Of Fuel/Water Separator Filter Housing; Replaces 12639450, 97384931, 12639277) 3.9 Water in Fuel Sensor | eBay Fits 2001-2012 Chevy/gm Trucks With 6 Duramax Diesel Enginethis Sensor Screws Into The Bottom Of The Fuel Filter Housing And Has A Valve In The Bottom That Can Be Used To Drain Water.