Well, after staring at it for awhile I figured "it ain't gonna fix itself". So I got to work.
First job was to take apart the pump again and see what is up. Then I put one end of the hose on the nipple to the tank, the other in my mouth, and blew. Could sort of blow, but when I sucked I barely got anything.
Took apart the bumper and felt in the tank. I can't find the inlet hole, but I know sort of where it is. Anyway I got tired of blowing so I took a can of compressed "air", stuck the straw into the nipple, and let it have it. Why not?
Blew out for a few seconds, hooked up the hose, and tried sucking. No pressure difference between blowing and sucking. Which is good. So I think the root of the problem is that the inlet port was partially clogged with some crud and blowing it out with compressed air cleaned it.
Washed out the bladder, re-assembled, and fired it up. Pumps a *lot* more fluid, out the back jets too. So I think this was the problem.
However now the battery is dead and when I plug it into the charger I don't get a light on the charger. When I plug in the charger with nothing attached the green light flashes twice, but with the scooba nothing.
Terrific. Any ideas on that one? It just stopped with a dead battery, and I really don't want to charge the silly thing manually...
Yes, I have blown up batteries.