Black plate (30,1)
DURAMAX Diesel Engine (LML/LGH) - 2011
9-30
Driving and Operating
Fuel Priming
In order for the fuel system to work
properly, the fuel lines must be full
of fuel and contain no air. If air
gets into the fuel lines, it will be
necessary to prime the fuel lines to
eliminate air before operating the
vehicle and the fuel operated
heater (FOH).
If air is in the fuel lines. One of the
following may have happened:
.
The vehicle ran out of fuel.
.
The fuel filter was removed for
servicing or replacement.
.
The fuel lines were removed or
disconnected for servicing.
.
The fuel filter water drain valve
was opened while the engine
was running.
.
The fuel operated heater (FOH)
pump and FOH fuel lines were
removed or disconnected for
servicing.
If one or more of the above occur,
it is very likely that air has entered
the fuel system and priming the fuel
system is needed before operating
the vehicle. Air in the fuel lines
does not harm the engine, the fuel
operated heater (FOH), or the
vehicle.
However, the engine and/or the fuel
operated heater (FOH) may not be
able to start until the fuel system is
primed and the air is removed.
To Prime the Vehicle
(Pickup Models)
The vehicle is equipped with a
priming pump which is part of
the engine mounted fuel filter.
The priming pump is hand operated
and is designed to bring fuel to the
engine to eliminate any air in the
fuel lines. To prime the engine:
1. Correct the condition that
caused the loss of prime by
making sure there is fuel in
the tank.
2. Make sure the fuel filter has
been installed and properly
tightened.
3. Make sure the fuel lines are
properly connected and the fuel
filter is cool enough to touch.
4. Remove any dirt from the fuel
filter head and vent valve by
wiping with a cloth.
5. Open the fuel filter vent
valve by turning the screw
counterclockwise several full
turns. The vent valve is located
on top of the fuel filter housing.
6. Repeatedly push down on the
fuel filter priming pump with the
palm of your hand. The pump is
located on top of the fuel filter
housing. Let the pump return
upward between pushes.
7. Operate the priming pump until a
small amount of fuel seeps from
the vent valve. When fuel is
seen, the filter is now full of fuel
and the system should be
primed.
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