There is a backflow preventer in the pump that is supposed to isolate the pump and tank when you use city water, yours failed. Easy to disconnect and clean out, if you don’t want to replace the pump. However, I don’t see how that would cause your current problem.
Was wondering why no one had mentioned this yet.
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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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