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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Water-in-Fuel Lamp Diagnosis >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

The water in fuel sensor has a ignition circuit, signal circuit, and a ground circuit. The Engine Control Module (ECM) monitors the signal circuit for a predetermined voltage. The ECM determines the amount of water in the fuel with a sensor located in the fuel filter assembly. When the water in the fuel is above an acceptable level, the ECM sends a request to the instrument panel cluster to illuminate the Water In Fuel lamp.

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