C 2500 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1984)
Figure 1 - 1984 6.2L DIESEL FUEL FILTER
During refueling, it is possible for water to be pumped into the fuel tank along with the fuel. The 1984 vehicles have a water
separation system in the filter (Figure 1). The vehicle also has a "water in fuel" light in the instrument cluster which is designed to
come on if water has accumulated in the fuel filter or if the filter becomes plugged. The "water in fuel" light is also designed to come
on during engine starting as a check that the bulb is working. If the light does not come on, check the bulb and fuse.
If the "water in fuel" light comes on, the following chart may help determine the cause.
"WATER IN FUEL" LIGHT CHART
CONDITION
RECOMMENDED DRAIN
Light Comes On
Drain Water From Fuel
Intermittently
Filter
Light stays on-engine running.
1.
Temperature above Drain fuel filter immediately. freezing. If no water is drained and
light stays on -- replace fuel filter.
2.
Temperatures below Drain fuel filter immediately. freezing. If no water can be drained --
water may be frozen. Open air bleed to check for fuel pressure. If no fuel pressure, replace filter.
Light Comes on at High Speed or Heavy
Accelerations
Fuel Filter Plugged - Replace
Light stays on continuously -- engine stalls will not restart.
1.
After initial start Fuel filter or fuel lines may up. be plugged. Replace or clear
lines.
2.
Immediately after Fuel tank purging required. refueling -- large See "Fuel Tank Purge procedure.
amounts of water probably pumped into the tank.
Fuel Tank Purge Procedure
CAUTION: Use caution when working on or near the fuel tank or other parts of the fuel system. Use the same safety precautions you would normally
use with gasoline when handling and disposing of the purged fuel. To dispose of purged fuel, contact a waste oil collection facility, a
dealer, or a service station. Improper or incomplete service could lead to damage of the vehicle or its equipment or personal injury.
