Hey Charles Richard-
There's a filter that sits in the lid of the dirty water tank. On top of this filter is a square filter cover with a hole in it, that sits on top of the filter. That's what makes a seal with the "suction port" immediately above.
That's one of the most common things I'd see when the FloorMate wouldn't pick up water.
That, or the clear hose that actually carries the water from the squeegee to the tank (you can see it with the handle in the operating position) would crack, and there'd be the suction loss.
Either of those two things help at all?
~F
Here's a picture of the filter cover--from the owners manual:
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