If Seadog's fix doesn't work (try it a few times), you'll have to replace the check valve. Some check valves are internal to the pump, some are in the pumps discharge line. Or simply add another one in the discharge line.
I've attached a generic plumbing pic, with some additional tidbits of information, for your use.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
|