Water-In-Fuel Sensor Replacement at your home or office.

Our certified mechanics come to you · Backed by our 12-month, 12,000-mile warranty · Get a fair and transparent estimate upfront

Water-In-Fuel Sensor Replacement Service

What is the Water-In-Fuel Sensor all about?

In order to run, your engine needs both air and fuel (either gasoline or diesel). Water can cause severe damage if it contaminates gasoline or diesel. While there’s no way to completely eliminate all traces of water from the fuel, the situation can be monitored, which is the purpose of the water-in-fuel sensor. The water-in-fuel sensor is typically located in the fuel filter housing, and constantly checks the electrical conductivity of the diesel fuel in the filter as the two substances have different conductive properties. If there is excessive water found in the fuel, the sensor sends a signal to the vehicle’s instrument cluster to illuminate the water-in-fuel warning. If the water-in-fuel sensor is not working properly, you may not be able to tell if your fuel quality is proper. Excess water in your fuel can cause a rough run, excessive white exhaust (water vapor), and a stalled engine.

Keep in mind:

  • Some diesel fuel filters require the water-in-fuel sensor to be replaced every time the fuel filter is changed.
  • Diesel engines commonly use a fuel-water separator filter to remove excess moisture in the fuel.

Our recommendation:

There is no set maintenance interval for most water-in-fuel sensors, though if your owner’s manual says to replace it when the fuel filter is changed, do so. Have one of our expert mechanics diagnose and replace the water-in-fuel sensor if required.

What common symptoms indicate you may need to replace the Water-In-Fuel Sensor?

  • Water-In-Fuel indicator lamp is on
  • Engine runs rough or stalls
  • Exhaust is puffing excessive amounts of white smoke without a water-in-fuel warning

How important is this service?

The sensor itself is not critical to replace in a timely fashion, though it does indicate whether or not your fuel quality is adequate. You will not be able to tell if you have a fuel issue otherwise, so replace a faulty water-in-fuel sensor as soon as you are able to.

Fast and easy Water-In-Fuel Sensor Replacement service at your home or office.

Recent articles & questions

Understanding Tire Service Descriptions: Speed Rating and Load Index
There There never seems to be a shortage of questions you are asked when you inquire about tires. What size do you need? What speed rating do you require? How will you be using them? What load index do you...
P0140 OBD-II Trouble Code: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)
P0140 code definition O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2) What the P0140 code means P0140 is the OBD-II...
How to Replace Tie Rod Ends
The The tie rods are just one of many components in your steering system. The steering system consists of a steering wheel, steering column, a steering gear, tie rods and of course the wheels. In short, tie rods (https://www.yourmechanic.com/parts/tie-rod-end) are...

Car is misfiring, losign power and sputtering

The first thing to check is the computer for any codes. If you are getting misfire codes like P030x (https://www.yourmechanic.com/article/p0300-obd-ii-trouble-code-random-multiple-cylinder-misfire-detected-by-jamahl-walker), then you have a cylinder that is misfiring. The "x" is the cylinder that is misfiring. Also look for a...

Air bag light and low oil lights on

Hello there. You have a few different issues going on. The Oil Light (https://www.yourmechanic.com/article/how-to-react-when-your-oil-light-is-on-by-joyce-morse) does refer to the engine oil. When the Oil Light is on, caution should be taken when driving the vehicle, as damage can occur with the...

Wireless key have good batteries, central lock work very good but suddenly the two wireless keys stop working 2006 Toyota RAV4

Hi there - if both of the known good keys (https://www.yourmechanic.com/article/4-essential-things-to-know-about-the-keys-to-your-car) stop working, it is likely the key transceiver in the vehicle has stopped working for some reason. Check for blown fuses, just in case. The Toyota security system software...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com