Standard Ignition FWSS110 Water in Fuel (WiF) Sensor

Water in Fuel Sensor for Diesel Applications

The Standard Ignition FWSS110 is a water in fuel sensor for diesel fuel systems that need reliable contamination detection. It is built for service on Ford E-250, E-350, F-250, and F-350 applications from the late 1980s through the early 1990s, including Ford E-350 Econoline and E-350 Econoline Club Wagon coverage.

Standard Ignition FWSS110 is engineered with broad sensor coverage and controlled manufacturing from component to finished part, helping maintain consistent fit and function for diesel fuel system service.

Key Features

• Water in fuel sensor for diesel fuel delivery systems
• Bolt-on connector type with one connector and one stud terminal
• Male terminal design
• Includes O-ring seal
• 7/16" x 1.30 thread size
• Direct replacement coverage for select Ford diesel applications
• Standard Ignition FWSS110 part number for catalog matching

Detailed Description

This water in fuel sensor monitors diesel fuel contamination at the fuel system level and is used on select Ford trucks and vans, including 1988-1994 Ford E-350 Econoline, 1988-1994 Ford E-350 Econoline Club Wagon, 1988-1994 Ford F-250, 1988-1994 Ford F-350, and 1988-1991 Ford E-250 Econoline Club Wagon. The FWSS110 is a bolt-on style sensor with a single male stud terminal and an included O-ring seal for the sealing surface. If you are sourcing a Standard Ignition FWSS110 for Ford diesel fuel system repair, this part number is the reference to verify against the original sensor.

This part cross-references FSS110 and E8TZ9J308A for the same application.

What It Helps Address

• Water contamination warning in diesel fuel systems
• Faulty or inaccurate water-in-fuel sensor readings
• Fuel system warning light concerns tied to sensor failure
• Corrosion or sealing issues at the sensor mounting point
• Replacement needs during diesel fuel filter or fuel bowl service

Installation Notes and Tips

Verify the connector style, stud terminal layout, and 7/16" x 1.30 thread size before installation. Confirm the vehicle application against the original sensor location on the fuel system, especially on Ford E-350 Econoline, Ford F-250, and Ford F-350 diesel models. Clean the mounting surface and inspect the sealing area so the included O-ring seats properly.

Quality Assurance

Standard Ignition states that its sensor coverage is broad and that it controls manufacturing from component sourcing through finished product assembly. That process supports consistent production quality for diesel sensor replacement parts such as the FWSS110.