If the floor pump didn’t have a check valve or if the tube didn’t have the valve? If the tube doesn’t have a valve, the air can get in but, of course, it won’t stay there. The point is to pump up the tube.

If the floor pump doesn’t have a check valve or if the check valve is defective, a Presta valve has a better chance of being able to be pumped up than a Schrader. The Presta will close on the back stroke of the pump and act as a check valve like the pump’s own check valve. A Schrader valve will just flow back into the pump and push the handle up. If you can get air back into the shaft...which could be a big if...you could get air into the Presta and make it stay there. The same can be said for the Schrader.