Black plate (31,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 10/21/14
Driving and Operating
9-31
3. Place a container under the filter
drain valve. The filter drain valve
is on the bottom of the fuel filter.
For pickup models, the filter
drain valve is on the passenger
side of the engine compartment.
For van models, the filter drain
valve is under the vehicle on the
driver side, inside the frame rail.
4. For pickup models, open the
drain valve by turning it two to
three turns. Pump the primer
until fuel empties from the valve
and all of the water has been
drained. Close the valve hand
tight.
For van models, open the fuel
filter drain valve by turning it two
to three turns. Allow the filter to
drain until all of the water has
been removed. Close the valve
hand tight.
5. Properly dispose of the water
contaminated fuel.
6. Install the fuel cap.
7. 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 and the fuel operated
heater (FOH).
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.
.
The FOH pump and FOH fuel
lines were removed or
disconnected.
The system is not harmed by air in
the fuel lines; however, the engine
and/or the FOH may not start until
the fuel system is primed and the air
is removed.
To Prime Pickup Models
The priming pump is part of the
engine fuel filter and will bring fuel
to the engine to eliminate air in the
fuel lines. To prime the engine:
1. Correct any condition that
caused the loss of prime.
2. Check that the fuel filter is
installed and properly tightened,
and cool enough to touch.
3. Check that the fuel lines are
properly connected.
4. Remove any dirt from the fuel
filter head and vent valve.
