Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
26 Driving and Operating
Problem
Recommended
Action
Immediately after
refueling, message
displays and
stays on.
A large amount of
water is in the fuel
tank. Drain the fuel
filter immediately.
If the message stays
on or comes back
on without
refueling, then fuel
tank purging is
required. See your
dealer. If the
message displays
and the engine
stalls or runs rough,
do not drive until
the water
contaminated fuel is
drained.
Caution
Driving with this message on can damage
the fuel injection system and the engine.
If the message comes on right after a
(Continued)
Caution (Continued)
refuel, water was pumped into the fuel
tank. Turn off the engine and drain the
water immediately.
Removing Water from the Fuel Filter
To drain water:
1. Turn the engine off and apply the
parking brake.
2. Place a container under the filter drain
valve. The filter drain valve is on the
bottom of the fuel filter. The filter drain
valve is under the vehicle on the driver
side, inside the frame rail.
3. Open the drain valve by turning it
counterclockwise. Allow the filter to
drain until all of the water has been
removed. Close the valve.
4. Properly dispose of the water
contaminated fuel.
5. Start the engine and let it run for a few
minutes. During the draining process, air
may have entered the fuel system. If the
engine stalls, the fuel system may need
to be primed. See “Fuel Priming”
following.
Fuel Priming
For the fuel system to work properly, the
fuel lines must be full of fuel. If air gets in,
the fuel lines need to be primed before
operating the vehicle.
If air is present, the following may have
happened:
.
The vehicle ran out of fuel.
.
The fuel filter was removed.
.
The fuel lines were removed or
disconnected.
.
The fuel filter water drain valve was
opened while the engine was running.
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