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Now I am worried about attending the FMCA rally in Gillette, Wyoming in July. We will go into "conservation mode" but what if we need a pump out? If I am understanding correctly, gray water should not be a problem due to all the vents. I am assuming the pump truck will create a larger vacuum than the vent can handle on the black tank? Is there some way to force the toilet flapper valve to stay open? Can't the pump truck throttle back to idle? Surely other Marathon owners have crossed this bridge. Why couldn't I stand by the toilet and continuously flush it to relieve the vacuum? Sure would appreciate other Marathon owners to give us their advice and experience.
Philip and Katie Parker
2000 Marathon
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Philip,
Just open black and gray tanks at the same time.
Gil and Durlene
2003 H-3 Hoffman Conversion
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GIL, after posting , I wondered why it would not be the best solution to just open both tank valves. Surely the pump truck couldn't overwhelm both tank vents or can it? But you are the first one to come up with this solution, after discussing macerators, swimming pools and so on. Wonder why only Marathon? I would still like to hear if anyone doesn't think this is the correct answer.
Philip and Katie Parker
2000 Marathon
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