replaced hard tanks with sacs, sacs won't stop draining???

[WakeSlayer]

07 should have had Jabscos, I believe that was the first year they changed over.

[bowvan]

I am sure we are all very happy with our custom systems. We've all put countless hours thinking and re-thinking a better way. The bottom line is no matter what system the boat manufactures are currently using, obsessive owners such as ourselves, will always try and make it better.

There are several reasons why most boat manufactures have switched to flexible impeller pumps. I wont pretend to know all of their reasons, but ease of installation and ease of repair have got to be on the top of the list. My experience with the ballast puppy's is limited to the original models with the f'd up impellers. It seems as if they have solved that problem with the new impellers. This is no doubt what caused the excessive amp draw which would not allow me to operate all three pumps without running the boat at high idle. It's good to see that the new pumps are working correct for you, but you can't deny that they haven't had their issues. Changing out the impeller, however, is easier than changing a bad valve.

The aerator pumps have had their issues as well, mainly issues with valves. I work with centrifugal pumps at my job, so I suppose I am biased towards them. I felt that if I could install reliable valves with less friction loss, I would have a reliable system that would fill quickly. Water will flow through a centrifugal pump, which I see a positive thing. When used in conjunction with the scoop style inlet, you can dramatically increase the amount of output the pump produces (limited by the size of the hose). You can not do that with a flexible impeller pump. The amount of water discharged from the pump is directly related to the rpm's of the impeller. This is why I was mentioning running the boat at high idle. Increasing the voltage to the pumps improves their efficiency.

I actually think the perfect system would use both types of pumps. A large centrifugal pump (like 50 gpm) to fill and empty. A flexible impeller pump the prime the system. 1' or 1 1/8" hose all around. And a control manifold with automatic valves. Fill time would be 3 min.

[Sbt3]

Just an update on the draining. I turned the through hull fitting and pointed the barbed end up and looped the hose higher and this solved the problem of the water pushing through the pump. If we fill it super full it will still push through a little but not bad. Good to go for now.

[Batman]

I had areator pumps for emtying and never had a problem. I just put an extra foot of hose which kept the sack from draining.