47–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle cannot drop. Failure to follow these steps
could result in serious personal injury or death.
47–01 Fuel Tank Mounts and
Fuel Line Checking
WARNING
Inspect the components as described below. Fail-
ure to perform these inspections could result in
the failure of the fuel tank mounting assembly and
loss of vehicle control, possibly causing personal
injury or death, or property damage.
1. Chock the tires. Working at the front of the ve-
hicle or at the rear of the vehicle, raise the ve-
hicle so that the tires just clear the ground and
so that the suspension is fully extended. Place
safety stands under the vehicle frame.
2. Check the T-bolts that attach the fuel tank
mounting straps to the mounting brackets. Check
to see that the nuts are tight.
3. Inspect the fuel tank straps for damage or wear.
Replace them if necessary.
4. Inspect the fuel tank for leaks or damage. Re-
place the tank if necessary.
IMPORTANT: Do not attempt to repair a dam-
aged fuel tank; always replace a damaged fuel
tank.
5. Inspect the fuel lines for damage or wear.
6. Remove the safety stands and lower the vehicle.
Remove the chocks from the tires.
47–02 Fuel/Water Separator
Element Replacing
Alliance
The only maintenance necessary on an Alliance
fuel/water separator is to replace the filter element.
WARNING
Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to
open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.
1. Drain off some fuel by loosening the vent plug
and opening the drain valve. See
Fig. 1.
2. Disconnect the water sensor and heater connec-
tions if equipped.
3. Remove the element and bowl together, by turn-
ing counterclockwise.
4. Remove the bowl from the element and clean
the O-ring seating surface.
5. Apply a coating of clean fuel or motor oil to the
new O-ring and element seal.
6. Spin the bowl onto the new element, then spin
them both onto the filter head, snugly, by hand
only.
IMPORTANT: Do not use tools to tighten the
bowl and element.
7. Connect the water sensor and heater connectors
if equipped.
8. If equipped with a primer pump, prime the
fuel/water separator.
8.1 Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug.
8.2 Close the vent plug.
9. Start the engine and check for fuel leaks.
10. Shut down the engine and correct any fuel leaks.
Fuel 47
Recreational Vehicle Chassis Maintenance Manual, April 2018 47/1
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