Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Water In Fuel Indicator: Testing and Inspection
Fig. 4 Water in fuel detector & tank purge procedure. 1980---84
DESCRIPTION & OPERATION
1980---84
The Water In Fuel warning system employs an electronic water detector mounted inside the fuel tank on the fuel gauge sending unit. The detector
provides a warning when 1---21/2 gallons of water are present in the fuel tank by lighting a warning lamp on the instrument panel. The sending unit
assembly also contains a provision for siphoning off water in the fuel tank through the fuel return line, Fig. 4.
The Water In Fuel lamp will come on for 2---5 seconds each time ignition is switched to Run position to ensure lamp is operating. If water is present
in fuel, the lamp will come on after a 15---20 second delay and remain on.
Fig. 5 Water in fuel detector. 1985---88
1985---88
The Water In Fuel warning system employs a fuel detector integral with the fuel filter and fuel heater, Fig. 5, and mounted on the engine. When more
than 2.2 ounces of water has collected in the filter, the Water In Fuel lamp on the instrument panel will light. After the light comes on, the filter should be
drained as soon as possible and must be drained within 2 hours of operation.
1985---88
