Check to be sure there is still water there. You might have a leak in your resevoir that allows the water to escape. If that's OK, the next thing to check would be if you see water escaping anywhere else when you use the squirters...maybe in the cowl area. Someone already mentioned it but make sure the nozzles are not clogged with wax or something. If all of that comes up OK, I would remove the water pump and make sure its actually pumping water and not just making noise.