Filling The Tank - GMC Duramax Diesel 2018 Owner's Manual Supplement

The fuel filter is on the driver side,
inside the frame rail in front of the
fuel tank.
1. Drain any water from the filter.
See Removing Water from the
Fuel Filter in Water in Fuel
0 49.
Keep the engine off until the
procedure is completed.
2. Apply the parking brake.
3. There are two caps under the
filter. Clean the fuel filter area
before removing these two
filter caps.
Caution
Failure to cover the fuel filter with
a clean cloth to keep out debris
when replacing may cause dirt to
get into the engine. This could
cause engine damage. Keep the
fuel filter covered with a clean
cloth when replacing.
4. Remove both filter elements.
If there is any dirt on the filter
sealing surface, clean it off.
5. Install the new filter elements
and tighten both caps.
Driving and Operating
6. Use the fuel filter priming
procedure earlier in this section
to prime the fuel filter.
7. Start the engine and let it idle
for five minutes. Check the fuel
filter for leaks.
8. Reset the fuel filter monitor.
See Driver Information Center
(DIC) 0 21.

Filling the Tank

Warning
Fuel vapors and fuel fires burn
violently and can cause injury or
death.
To help avoid injuries to you
and others, read and follow
all the instructions on the
fuel pump island.
Turn off the engine when
refueling.
Keep sparks, flames, and
smoking materials away
from fuel.
(Continued)
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