This happens to me all the time. The end of the hose ( at the pump area ) seems to come undone from the bottom of the reservoi when I go off-roading. Its a weird angle and a tight sqeeze to put it back; but it can be done. On my mom's VX her hose comes undone from the top ( hood area ). If you fill out the reservoi and the hose is not connected at the pump area you will lose all the water in less than 10 secs while pussing the lever to access the water.