GMC 2003 C4C042, Owner'S Manual

Page: 309 / 386

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Primary Fuel Filter and Water Separator
(If Equipped)
If you have a diesel engine,
you may have this spin
-
on
filter. It is located on the
driver’s side frame rail.
It has a clear plastic drain bowl at the bottom. Check the
drain bowl occasionally for any water or particles.
To drain the bowl, do the following:
1. Shut off the engine.
2. Partially open the drain valve at the bottom of
the filter.
See “Engine Oil” in the Index for proper disposal
procedures.
Secondary Fuel Filter and Water
Separator/Heater (If Equipped)
If you have a Caterpillar
R
diesel engine, you may also
have this spin
-
on filter and
fuel separator/heater. It will
be mounted in the engine
compartment on the driver’s
side of the vehicle.
It has a metal drain bowl at the bottom. Occasionally,
check the bowl for any water or particles.
To check or drain the bowl, do the following:
D Shut off the engine.
D Push up on the spring loaded drain valve until clear
fuel is flowing from the valve.
The particles or water will drain out first. See “Engine
Oil” in the Index for proper disposal procedures.