Marine Head (Peggie ? )
I have a Jabsco 29090-3000 on my Cat 320. This is the "Twist N Lock" model.
With the fluch control lever in the shut position while emptying the bowl, I have pressure or resistance which can be eleminated to permit emptying the bowl if I hold the flush control lever fully over by hand while finishing the pump. Which parts need to be replaced? Is there a diagnostic procedure? I have the owner's manual with exploded view with part numbers.