I have a bissell steam and sweep. when I am finished using it water still leaks from the bottom leaving water?

SOURCE: Bissell 1720-1 Little Green

If it isn't spraying, the pump is most likely bad, leaking from tank, depending where it is leaking, may need a new tank. But Bissell has obsoleted this unit and its parts. So unless you can find the parts somewhere, it may be time for a new one.

SOURCE: Bissell pro heat 2x multi surface carpet cleaner making spots

maybe there's not enough vacuum or it hasn't been primed enough. I have a proheat that drove me crazy till I started leaving the heat switch on. I get wads of carpet fiber that mat around brush and spit out on the carpet, so I frequently remove them. I'm just wondering if after you empty the water, it may not have built up the suction. Good luck! hope this may be helpful

SOURCE: I used my new proheat 2x steam cleaner the first

You may have mislaid a piece when you took your Bissell apart to clean it after using it the first time.

I experimented with mine to try and reproduce your issue. On the bottom of the water tank, there are two pieces that can be removed from it. One of them looks like a black plug at one end, with a red rubber flange piece on the other end. If you push your finger inside the red rubber piece, you can feel a spring move up and down. This is the first piece you place on the bottom of the water tank. I suspect you have this piece, because if you didn't, water would gush out of the water tank as soon as you turned it over after filling it.

The other piece, which is the one I think you may have have mislaid, is a larger black, plastic ring with screw threads. This piece goes over the top of the first plug piece, screws onto the water tank, and holds the plug in place. The words "RECLOSE TIGHTLY" appear on mine. If this piece is missing, the water tank does not sit flat on the base of the Bissell, but kind of flops around, out-of-place, and the unit will not dispense water properly, though it may leak it.

If ithat piece is gone, it should be possible to reorder it. Start here:
http://www.bissell.com/Customer_Service.aspx

If that's not the problem, if you have all the water tank pieces, I wonder if perhaps you unscrewed one black screw to remove the clear front plastic piece from the base of the unit-- the piece through which water is drawn up off the carpet-- to clean it, and didn't get it back into place properly. Make sure the two hooks at the bottom of this piece are inserted, one per side, into the clear plastic side pieces at the bottom. If the hooks are not secured properly, before trying to reinsert them, unscrew the black plastic screw so you don't break the tab. It's easy to miss getting these one of those hooks back in right, but it's important to do that before trying to screw the clear front plastic piece into place.

SOURCE: bissell spotbot: leaking the dirty

I had the same issue. After some research, I determined I was missing a black "duckbill" gasket on the bottom of the dirty water collection tank.

This caused reduced suction, and for the water to pool at the botom of the spotbot, thus leaking.

I purchased the gasket at Bissell for 1.39. The part number is 203-6646.

I purchased my SpotBot new from Target, and never remember seeing this black gasket, but the difference is night and day.

SOURCE: Bissell pro heat steam carpet cleaner, not releasing water.

That means that you need to replace the pump belt. Here is the belt you need and a manual you can view:

Bissell 7901 Belt and Manual

Testimonial: "just what I was looking for thank you"