C 2500 3/4 Ton Pickup 2WD V8-350 5.7L VIN M 4-bbl (1984)
1980---84
1.
If warning indicator fails to light during bulb check, proceed as follows:
a. Disconnect electrical connector from fuel gauge sensing unit.
b. Ground yellow/black wire in connector, then turn ignition to Run position.
c. If indicator lamp lights, remove fuel gauge tank unit and check yellow wire for opens. Also, check connections to Water In Fuel detector and
mounting screws. If connections and attachments are satisfactory, replace detector.
d. If indicator lamp fails to light, check indicator lamp bulb. If bulb is satisfactory, check for open in yellow wire between lamp socket and
sending unit and repair as necessary.
2.
If warning indicator is lit at all times, proceed as follows:
a. Disconnect electrical connector from fuel gauge sending unit, then turn ignition to Run position.
b. If light remains lit, repair short to ground in yellow/black wire between sender and warning lamp.
c. If light goes out, drain water from fuel tank, then recheck circuit. If lamp remains on with harness connected to sending unit, wiring to water
detector or the detector itself is at fault.
