GMC Duramax 3.0L, Supplement Manual, Page: 32 / 71

Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
Driving and Operating 31
2. Follow the fuel priming
procedure earlier in this section
to prime the fuel filter.
3. Turn the ignition to START for
10 to 15 seconds at a time until
the engine starts. If the engine
tries to run, but does not run
smoothly, increase the rpm
slightly by using the accelerator
pedal. This will help force air
through the system.
4. Return to Step 2 if the engine
stalls and will not restart.
5. After a few attempts, if the
engine still does not start, see
your dealer.
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.
To replace the fuel filter:
1. Drain any water from the filter.
See “ Removing Water from the
Fuel Filter ” in Water in Fuel
0 27 .
Keep the engine off until the
procedure is completed.
2. Apply the parking brake.
3. Remove the filter element cap
by turning it counterclockwise.
4. Remove the filter element.
If there is any dirt on the filter
sealing surface, clean it off.
5. Install the new filter element
and o-ring.
6. Reinstall and tighten the filter
cap to the housing.
7. Use the fuel filter priming
procedure to prime the fuel
filter. See
“ Fuel Priming ” in
Water in Fuel 0 27 .
8. Start the engine and let it idle
for five minutes. Check the fuel
filter and air bleed valve for
leaks.
9. Reset the fuel filter monitor.
See Driver Information Center
(DIC) 0 12 .
Filling the Tank
An arrow on the fuel gauge
indicates which side of the vehicle
the fuel door is on. See
“ Fuel
Gauge ” in the Owner ’ s Manual. Do
not refill the diesel fuel and Diesel
Exhaust Fluid (DEF) at the
same time.