X2 about getting individual manuals for various components/appliances
That Yellowstone Trailer......didn't they use a 'compressed air' system to 'pump' water from fresh water tank thru plumbing system vs a 12V DC pump?
HERE is a 'manual exchange/request' link.
Might try requesting a manual for that Yellowstone cause if it used the air compressor system it's a bit different and would be in the manual.