We just bought a Nonsuch 33 with a Wilcox Crittendon head that is now 20 years old. The head pumps out overboard okay, through a bewildering spiderweb of hoses, but will not suck any water in, not enough to even have some water in the bowl. The only way we can flush is by pouring a bucket of water into the bowl and pumping with the pedal down. I managed to track down a repair kit and replaced everything I could but I could not get the camshaft out of the inlet chamber so I could not replace any of those bits. Any suggestions would be greatly appreciated.