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Old 01-12-2022, 05:16 PM   #12
Cummins12V98
Senior Member
 
Join Date: Feb 2013
Location: on the road
Posts: 1,188
Had it happen to me. Neighbor knocked on my door and said water was pouring out. Sure enough it was coming out the vent. Inside the water pump there are check valves that can go bad and allow water past into the tank. Replaced the water pump and all was well.
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