How full is the water tank? If at any angle and tank low, could be that the water level is below the pickup. A lot of tanks are longer and wider than they are high. Makes it possible for there to be a considerable amount of water in the tank but all of it over in the wrong corner.
"A wise man can change his mind. A fool never will."
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2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan