Will a jabsco macerator lift?

[Dockhead]

Originally Posted by Mike Banks

Macerators aree not designed to lift--because of the blades designed to chop up the solids within the stream. They push very well though--so set your macerator right next to the heads pedestal and you should be OK pumping it to any reasonable height--but you will need a syphon-breaker as well, to stop the macerated waste within the ascending part of the pipe (or the excess flush water) running back and overflowing the pedestal.

Well, they don't pump with their blades. If you've ever had to service one ( ), you will know that besides blades, they have impellers, much like our engines' raw water cooling pump impellers. The impeller is what pumps, not the blade. The Jabsco ones are rated to self-prime and pump uphill to 1.2 metres.

[Mike Banks]

Quite right--but the pumps are designed to push not pull. The blades alone do not do all the job--life would be simpler if they did.

And yes--I have pulled apart and reconditioned one or two of them. They do push out quite an impressive amount of pressure--as they are designed to do.

[captlloyd]

Originally Posted by Gripfast

It ran till the run dry feature shut it down, twice....so i will replace the impeller. I can lift and tilt the tank to fill the line, but before i do that, i will try to clear any vents. It has a threaded lid, i can open the lid to make sure it vents.
This has the potential to be a mess....
Thanks.

We have trouble in River City ! It starts with a P and it rhymes with T that stands for Trouble !! ( The Music Man, just a little humor from a composting head lover ).

[peghall]

You might want to consider reading the owners manual for the Jabsco macerator pump. It's designed to empty a holding tank, not a toilet bowl...although there are a few people (you included apparently) who've been know to jury-rig a macerator pump to replace a manual toilet pump instead of replacing it with a proper macerating electric toilet...and without much of an understanding of how it actually works. The actual macerator is just a chopper blade, akin to the blade in a blender. It's actually the impeller that pulls waste from the tank and pushes it to the thru-hull.

And if you do read the owners manual Jabsco Macerator Pump owner manual, you'll learn that it CAN lift tank contents up to 5'.

Peggie
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein

[peghall]

...but the pumps are designed to push not pull.

If that were true, how could a macerator pump installed at or above the top of the tank--as many are--pull the waste out of the tank?

Peggie
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein

[KeelMe]

You can suck on the discharge line to prime it.

[a64pilot]

Actually all pumps create pressure better than a vacuum, it’s just physics.
Almost any pump can easily create more than 15 PSI, but even a super vacuum pump can only suck a little less than 15 PSI, cause that is a pure vacuum.
We really should have our fuel filters on the pressure side of the pump, but doing so may be a safety hazard as a leak would spray fuel as opposed to just sucking air.
Most land vehicles have the fuel filter after the pump.

So far as sucking on the hose, can I watch?

[J.Kitchens]

Originally Posted by KeelMe

You can suck on the discharge line to prime it.

This guy makes some of the funniest nonsense remarks.

This reminds me of when Al Bundy got a job sucking stink.