May have a "control center" on the outside wall near the water hose connection, and you need to change some of the valves to certain positions to be able to fill the FW tank. Had a '05 Greyhawk with this control center with 4 or 5 valves behind the door, had to move some to fill the FW tank, winterize, etc.
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'08 Greyhawk 31SS Traded in
2018 MR2410RL
Goodyear Endurance
Equalizer WDH
TV 2018 F150 FX4 SC 3.5EB TP/MT
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