Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
Driving and Operating 27
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
If the engine has stalled due to running out
of fuel, try to restart it:
1. If parked on a level surface, add at least
3.8 L (1 gal) of fuel. Up to 18.9 L (5 gal)
may be needed if parked on a slope.
2. Follow the vehicle fuel system priming
procedure earlier in this section to
re-prime the system and restart the
engine.
If the malfunction indicator lamp (check
engine light) comes on due to running out
of fuel, it may take a few drive cycles to
clear.
Fuel Filter Replacement
{
Warning
Diesel fuel is flammable. It could start a
fire if something ignites it, and people
could be burned. Do not let it get on hot
engine parts, and keep matches or other
ignition sources away.
The fuel filter is on the driver side, inside
the frame rail.
Prior to opening the filter and cap assembly
or servicing the filter, clean the outside of
the cap with a clean rag to ensure no dust
or dirt gets inside the filter.
To replace the fuel filter:
1. Drain any water from the filter. See
“Removing Water from the Fuel Filter” in
Water in Fuel 0 25.
Keep the engine off until the procedure
is completed.
2. Apply the parking brake.
3. Remove the filter element cap by turning
it counterclockwise.
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