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Cadillac XT4 Owner Manual (GMNA-Localizing-Europe-16412942) - 2023 -
CRC - 5/25/22
238
Driving and Operating
Caution (Continued)
directly after refuelling, water has been
pumped into the fuel tank. Turn off the
engine and drain the water immediately.
Removing Water from the Fuel Filter
To drain water:
1. Turn the engine off and apply the
parking brake.
2. Place a container under the filter drain
valve, which is on the bottom of the fuel
filter.
3. Turn the drain plug anticlockwise using a
suitable tool.
4. With the engine turned off, press and
hold ENGINE START/STOP without
applying the brake for five seconds to
place the vehicle in Service Mode. See
. Wait
approximately five seconds, and then
press ENGINE START/STOP again to turn
it off. This operation will enhance water
flow out of the filter. The filter is drained
as soon as diesel fuel emerges from
the port.
5. Retighten the drain plug by turning it
clockwise.
6. Properly dispose of the
water-contaminated fuel.
7. Start the engine and let it run for a few
minutes. During the draining process, air
may have entered the fuel system. If the
engine stalls, the fuel system may need
to be primed. See
“
Fuel Priming
”
following.
Fuel Priming
For the fuel system to work properly, there
must not be any air in the fuel lines. If air
does enter, the engine may not start and
the fuel lines will need to be primed before
operating the vehicle.
If air is present, the following may have
occurred:
.
The vehicle has run out of fuel.
.
The fuel filter was removed.
.
The fuel lines were removed or
disconnected.
.
The fuel filter water drain valve was
opened while the engine was running.
To prime the fuel lines:
1. With the engine turned off, press and
hold ENGINE START/STOP without
applying the brake for five seconds to
place the vehicle in Service Mode. See
. Wait
approximately five seconds and press
ENGINE START/STOP again to turn it off.
Perform this step three times or more
while the engine is turned off.
2. Press and hold ENGINE START/STOP while
applying the brake for a maximum of
40 seconds at a time, with five seconds
between attempts, until the engine
starts. If the engine tries to run, but
does not run smoothly, increase the
engine revolutions slightly by using the
accelerator pedal. This will help force air
through the system.