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Bill,
The tank has a vent that goes up to the roof. Unless the vent is totally clogged there is no pressure build up in the tank when the valve is closed and the flush hose on. The warning is to prevent you from forgetting to stop the flush hose and filling the tank up so it is full or over full the first time you use it.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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