V 3500 P/U 4WD V8-379 6.2L DSL (1988)
Water In Fuel Indicator: Service and Repair
The water in fuel indicator will be illuminated when excessive water has entered the fuel system. As the fuel filter becomes plugged, a low pressure
sensor activates the lamp. The lamp will be illuminated during engine starting as a bulb check. Once the engine has started, the lamp should go off. If the
lamp is illuminated intermittently, drain fuel filter. If lamp remains illuminated, drain fuel filter. If the lamp still remains on after fuel filter has been
drained, replace fuel filter. If lamp is illuminated during high speed operation or during heavy acceleration, replace fuel filter. If after starting, the engine
stalls and will not restart and lamp remains illuminated, check for plugged fuel filter or fuel lines. If this condition occurs immediately after refueling,
check fuel tank for large concentration of water in fuel, and if necessary purge fuel tank and replace fuel filter. After performing the required service, the
increased fuel pressure through the fuel filter will reset the water in fuel lamp.
