Check the valving at the pump. Many RV's have bypass valves that you close when using an outside water source and open to use the on board tank. If the pump is on line with the fresh water tank and all valves are open, you may need to prime the pump. Sorry I can't be more specific as I don't own your particular RV. Owners manuals on RV's tend to be outdated and vague at best, you're better off researching this forum and experimenting. Good Luck and God Bless.
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Otegoans
Ken and Wendy
'15 silverback 29RE
'13 GMC 2500HD
Duramax/Allison
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