GMC 2010 T-Series, Owner'S Manual

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To replace the element, do the following:
1. Disconnect the element electrical connector from
the bowl.
2. Loosen the self-venting drain to empty the bowl
of water.
3. Remove the filter element from the mounting head
with the bowl connected.
4. Remove the bowl from the filter element. Clean
the bowl and the O-ring gland and save them
for re-use.
5. Lubricate the O-ring with clean diesel fuel or motor
oil and place it in the bowl gland.
6. Spin the bowl onto the new filter element snugly by
hand. Do not use tools to tighten them together.
7. Lubricate the filter top seal with clean diesel fuel or
motor oil.
8. Fill the filter element/bowl assembly with clean
diesel fuel and attach it onto the mounting head.
Hand tighten an additional one-third to one-half
turn after full seal contact is made.
9. Complete the priming procedure. See “ Fuel
Priming. ”
10. Start the engine and check that there are no leaks.
If the water-in-fuel light comes on again after driving a
short distance or if the engine runs rough or stalls, a
large amount of water has probably been pumped into
the fuel tank. The fuel tank should be purged.
Fuel Priming
In order for the diesel engine fuel system to work
properly, the fuel lines must be full of fuel and contain
no air. If air gets into the fuel lines, it will be necessary
to prime the fuel lines to eliminate air before operating
the vehicle.
Air can get into the fuel lines if any of the following
happen:
. The vehicle runs out of fuel.
. The fuel filter is removed for servicing or
replacement.
. The fuel lines are removed or disconnected for
servicing.
. The fuel filter water drain valve is opened while the
engine is running.
Air in the fuel lines will not harm the engine or the
vehicle. However, the engine may not be able to start
until the fuel system is primed and the air is removed.
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