If you have the outside anti-freeze hookup, check that the valve between it and the pump is closed, and the valve between the fresh water tank and the pump is open. Some RVs have a single 3-way valve; if you have that, it should be aligned to the FW tank, not the anti-freeze hookup.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10