Look at the water tank. There is a valve that can be opened and allow water to bypass the pump and go straight to the water tank. (usually this valve is within a foot of the water tank.)When using this valve, make sure you stay right there while filling. You can over pressure the water tank if left on too long. On my 99 Pace it is the same valve that drains the tanks. (You have to open the valve and a second drain valve) On other models the tank has only one drain valve. These are usually large red handle valves that directly drain the tank. They still have the fill valve that goes directly into the tank.
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.