That's sure a lot of air in the line. And with the pump going for a long time, it would seem it's sucking/pumping air into the system, hence the long pump time until pressure settles in.
I believe that you're in for a serious session of opening stuff up to get a good look at your pump and fresh water tank plumbing.
Out of curiosity, how is your plumbing when you're hooked up to a water source?
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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