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Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
30
Driving and Operating
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.
Priming the Fuel System
There is an electric priming pump
that will bring fuel to the engine and
eliminate air in the fuel lines. To
prime the engine:
1. Correct any condition that
caused the loss of prime.
2. Turn the ignition on for
30 seconds. Do not start the
engine. The fuel pump will start
priming.
3. Turn the ignition off, then back
on, and crank the engine for
15 seconds.
4. If the engine does not start,
repeat Steps 2 and 3 until the
engine starts.
If the engine does not start
after repeating Steps 2 and 3
three times, turn the ignition off
for 60 seconds.
5. Repeat the above steps until
the engine starts.
6. If the engine starts, but does
not run smoothly, increase the
engine speed slightly.
7. If the engine starts and runs
but stalls again, turn the
ignition off for 60 seconds.
8. When the engine starts, let it
idle for a few minutes and
check the filter for any leaks.
Running Out of Fuel
{
Warning
Diesel fuel is combustible. It could
start a fire if it gets on hot engine
parts. You could be burned. Catch
any fuel from the air bleed valve,
and wipe up any spilled fuel with
a cloth.
If the engine has stalled due to
running out of fuel, try the following
steps to restart it:
1. If parked on a level surface,
add at least 7.6 L (2 gal) of
fuel. Up to 18.9 L (5 gal) may
be needed if parked on a
slope.