[C320-list] Head fresh water not pumping

[William Russell]

Just launched "Little Wing" on beautiful Cayuga Lake.  Having a few commissioning issues. 
The head will not pump fresh lake water into the bowl to help with flushing.  I've tried "head conditioning" 
liquid from West Marine, with little success.  Pump handle just goes up and down, with no resistance. 
Any guidance on troubleshooting this critical problem? 

Bill Russell 
"Little Wing" - 1998 C320 #545 
Ithaca, NY