GMC T-Series 2007, Owner'S Manual, Page: 200 / 356

To drain water, do the following:
1. Loosen the
self-venting drain
to empty the bowl
of water.
2. Tighten the drain. Run the engine and check
for leaks.
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” following.
10. Start your 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.
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