Standard Ignition FWSS101 Water in Fuel (WiF) Sensor

Water in Fuel Sensor for Diesel Applications

The Standard Ignition FWSS101 is a Water in Fuel (WiF) sensor for diesel fuel systems. It is built with thermoplastic materials that resist chemicals and high temperatures, plus a sealed construction that helps block humidity, water, and dust intrusion.

Compatible With Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD diesel applications, this sensor supports reliable fuel-system monitoring in heavy-duty trucks and vans. The FWSS101 is also a direct-fit option for several 2001-2011 Chevrolet and GMC diesel platforms.

Key Features

• Water in Fuel sensor for diesel fuel delivery systems
• Thermoplastic housing resists chemical exposure and extreme temperatures
• Fully sealed design helps protect against humidity, water, and dust ingress
• Cross-linked polyethylene insulated copper wiring resists chemicals and abrasion
• Male connector with plug-in style connection
• Female blade terminals with 2-terminal configuration

Detailed Product Overview

Standard Ignition FWSS101 is engineered for diesel vehicles that rely on accurate water-in-fuel detection to protect fuel-system components. The sealed sensor body and abrasion-resistant wiring are built for demanding underhood and chassis environments, while the connector and terminal design support straightforward electrical integration. This part cross-references Dorman OE Solutions 904-110 for the same application. Standard Ignition FWSS101 also cross-references Standard Ignition FSS101.

For Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD diesel models, this sensor helps maintain proper water detection at the fuel system level. It is also listed for Chevrolet Express 2500 and Express 3500 diesel applications, along with GMC Savana 2500 and Savana 3500 diesel applications.

Common Problems This Sensor Addresses

• Water contamination warning faults in diesel fuel systems
• Corrosion-related sensor signal issues from moisture exposure
• Electrical connection problems caused by damaged or degraded wiring
• Sensor failure from chemical exposure or temperature extremes
• Intermittent fuel-system monitoring on diesel trucks and vans

Installation Notes and Tips

Verify connector style, terminal layout, and diesel fuel-system application before installation. Match the vehicle’s original sensor location and inspect the harness, connector, and sealing surfaces for contamination or damage before connecting the new unit. Confirm fitment for the exact year and model, especially on Chevrolet Silverado and GMC Sierra heavy-duty diesel applications.

Quality Assurance

Standard Ignition manufactures this sensor with controlled production processes and material selection focused on durability in harsh operating conditions. The sealed design and chemical-resistant construction support consistent performance in diesel fuel-system service.