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Plumbing Systems and Holding Tanks
06-2
2. Gravity fill –The external gravity water
fill is located on the exterior of the motor
home. The on-board water tank can be
filled here. To fill the fresh water tank,
remove the cap, remove the vent plug, and
fill the tank using a potable water hose.
Draining the Fresh Water Tank
Avoid leaving the water in the tank when
the motor home is not in use. Turn the water
pump OFF before draining the water tank.
Whenever possible, drain the fresh water
tank before traveling. Water in the tank will
reduce the carrying capacity of the motor
home. See Motor Home Loading section of
the On The Road chapter.
The main water tank “quick-drain” valve may
be located on the end of the water tank, or in the
utility compartment.
Water Pump
The on-board fresh water system is pressurized
by a self-priming, 12-volt DC pump. The pump
operates automatically when the pump power
switch is ON and a faucet is opened. When the
faucets are closed, the pump shuts off. It can run
dry for extended periods without damage. See
Electrical Systems chapter.
Turn the pump master switch ON to pressurize
the system. When a faucet is opened after the
initial filling of the tank, the water may sputter
for a few seconds. This is normal and is not
cause for concern. The water flow will become
steady when all air is bled from the water lines.
Water Pump Filter
Dirt, mineral scale, and organic matter are
filtered out of the fresh water system by an
in-line water filter on the inlet side of the water
pump. If you suspect a clogged filter, it is easily
removed and cleaned.
Inspect the filter after running the first full tank
of water. Clean and inspect monthly thereafter.
The filter is located in the utility compartment
behind the service panel.
1. Loosen the clamp at the inlet end of the filter.
2. Pull the water line off the filter.
3. Unscrew the filter from the water pump.
4. Turn each end of the filter and pull apart.
5. Flush out and clean screen.
6. Reverse procedure to install.
7. Operate the water pump and check for leaks.
Low Point Drains
To drain hot and cold lines:
1. Open hot and cold low point drains.
2. Open the shower handle and faucet until all
water has drained from the lines.
Troubleshooting the
Fresh Water System
Water system problems usually fall into two
Typical Gravity Fresh Water Tank Fill
3
NOTE
Turn water pump off before traveling. Road vibration
could cause a faucet to open. If the water pump is
on, your fresh water supply could be pumped into the
holding tank.
CAUTION
Overfilling the fresh water tank from a pressurized
source may cause damage to the water system.
Monitor water tank filling continually .
!