Chevrolet Low Cab Forward 6.7L 2022 Owner's Manual page 183

182 Driving and Operating
because of the greater possibility of stuck
rings and guttered valves, resulting from
excessive ash deposits.
Water Separator
The purpose of the water separator is to
separate any water from the fuel that may
have formed in the fuel tank due to
condensation.
The water separator is located on the
bottom of the chassis side fuel filter.
Caution
Remaining water that is not discharged
from the water separator could freeze
and damage the vehicle.
If the warning light comes on while the
engine is in operation, promptly drain the
water from the water separator (fuel
filter). Continuing to drive with the light
remaining on could damage the fuel
injection system. If this happens, have
the vehicle checked and serviced by the
nearest dealer.
Draining Water from the Fuel Filter
Clean off any fuel that has adhered to the
vehicle body.
Starting the engine immediately after
draining the water from the pre fuel filter
requires a little more time than usual. If the
engine does not start in 10 seconds, wait for
a while and try again.
Fuel will be mixed in the drained water.
Dispose of it in a method conforming to the
regulatory requirements in your state.
If the water separator (pre fuel filter)
requires frequent draining, have the fuel
system inspected at your dealer.
Pre Fuel Filter
1. Put a container beneath the drain
plug (2) to receive fuel.
2. Loosen the drain plug (2) at the bottom
of the pre-fuel filter to drain out water.
3. Fully tighten the drain plug (2) and move
the priming pump (1) back and forth
several times.
Fuel Filter (Engine-side)
1. Attach a plastic hose to the drain
plug (2) on the bottom of the
engine-side fuel filter (1) and put the
other end of the hose in a container
placed beneath the filter.