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Plumbing Systems and Holding Tanks<br />
2. Gravity fill –The external gravity water<br />
fill is located on the exterior of the motor home.<br />
The on-board water tank can be filled here. To<br />
fill the fresh water tank, remove the cap, remove<br />
the vent plug, and fill the tank using a potable<br />
water hose .<br />
Fresh Water Tank Fill<br />
Draining the Fresh Water Tank<br />
Avoid leaving the water in the tank when the<br />
motor home is not in use . Turn the water pump<br />
OFF before draining the water tank . Whenever<br />
possible, drain the fresh water tank before traveling<br />
. Water in the tank will reduce the carrying<br />
capacity of the motor home . See Motor Home<br />
Loading section of the On The Road chapter .<br />
The main water tank “quick-drain” valve is<br />
located on the end of the water tank .<br />
07-2<br />
CAUTION<br />
Overfilling the fresh water tank from a pressurized<br />
source may cause damage to the water system.<br />
Monitor water tank filling continually .<br />
DRAIN<br />
MAIN WATER TANK DRAIN VALVE<br />
CLOSED<br />
Water Pump<br />
The on-board fresh water system is pressurized<br />
by a self-priming, 12-volt DC pump . The pump<br />
operates automatically when the pump power<br />
switch is ON and a faucet is opened . When the<br />
faucets are closed, the pump shuts off . A fuse at<br />
the load center panel protects the pump circuit .<br />
It can run dry for extended periods without damage<br />
. See Electrical Systems chapter .<br />
Turn the pump master switch ON to pressurize<br />
the system . When a faucet is opened after the<br />
initial filling of the tank, the water may sputter<br />
for a few seconds . This is normal and is not<br />
cause for concern. The water flow will become<br />
steady when all air is bled from the water lines .<br />
Water Pump Filter<br />
Dirt, mineral scale, and organic matter are<br />
filtered out of the fresh water system by an inline<br />
water filter on the inlet side of the water<br />
pump. If you suspect a clogged filter, it is easily<br />
removed and cleaned .<br />
Inspect the filter after running the first full tank<br />
of water . Clean and inspect monthly thereafter .<br />
The filter is located in the utility compartment<br />
behind the service panel .<br />
The water pump filter should be serviced when<br />
the fresh water tank is empty . Water may continue<br />
to drain from the water tank when the filter<br />
is removed for service .<br />
1. Loosen the clamp at the inlet end of the filter.<br />
2. Pull the water line off the filter.<br />
3. Unscrew the filter from the water pump.<br />
4. Turn each end of the filter and pull apart.<br />
5 . Flush out and clean screen .<br />
6 . Reverse procedure to install .<br />
7 . Operate the water pump and check for<br />
leaks .
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