By chance, did you happen to flip your winterizing valve? Make sure it's "off". If it's on, your water pump is sucking air, causing the spitting. Also, make sure your "fill / run" valve is NOT in the "fill" position. Regardless if running from your fresh water pump or from shore water, that valve should not be on "fill." It's put on "fill" only when actually filling the fresh water tank. Otherwise, it also will suck air and the end result is exactly what you are experiencing.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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