I took the old one apart and have no idea how it works. Certainly had no impeller so I am presuming diaphragm. I have installed a newer model of the same Jabsco pump. In their infinite wisdom, they changed the mounting bracket size slightly so only two of 4 holes lined up. That is almost as annoying as Standard Horizon, who sets the standard for this by using a different and incompatible charging base with each model of VHF handheld radio. Had to drill the other two which was remarkably awkward in the tight space. Fortunately I have a very small portable drill which made it possible. When assembled, it definitely generated vacuum on the inlet unlike the other pump. It seems to be generating water pressure now, but is not switching off when reaching cut off pressure. I am guessing that there is an air leak in the inlet side as there is no water leaking anywhere I could find. I did not have time to clean all the threaded PEX? fittings which were wrapped with teflon tape and looked pretty nasty. I will take those apart and rewrap them and assemble and see if that fixes the problem when I get back to the job. Dave
S/V Aries 1990 C&C 34+ New London, CT > On Aug 12, 2022, at 3:02 PM, dwight veinot via CnC-List > <cnc-list@cnc-list.com> wrote: > > Is it a diaphragm pump? If so the diaphragm may be shot > > On Wed, Aug 10, 2022 at 10:46 AM Bill Coleman via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > Try taking it apart and cleaning the vanes. Sometimes they get crud in there. > > Bill Coleman > > On Mon, Aug 8, 2022 at 10:24 PM David Knecht via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > Hi Folks- I found that my fresh water pump was running continuously today and > not pressurizing the system and not cutting out when pressurized. I > confirmed there was water in the tanks and flow to the manifold that controls > tank choice. But there was no water in the filter after the manifold and > before the pump. I removed the hose connecting the manifold/filter to the > pump and when I sucked on it, I got water, so nothing appears blocked. When > I turned the pump on (Par-Max4), I could not feel any suction on the opening. > I presume these are self-priming pumps, so I should have felt some pull. > The pump is 30 years old, so I am presuming it is just dead, but wondering if > there is any other scenario that might make it not work before I replace it. > Thanks- Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > <pastedGraphic.tiff> > > -- > Sent from Gmail Mobile
