On Thu, 15 Apr 2004 00:56:30 GMT, "Capt Frank Hopkins"
wrote:

This brings up another question. Could the pump out vacuum be causing the
tank to crack. It does "flex" when the unit is pumped out.

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It sounds to me like the tank is either not vented properly or the
vent has become plugged up in some way. It should definitely not flex
at any time.