macerator pump not dumping.... suggestions?

elvaktran

Cadet
Joined
Aug 20, 2011
Messages
6
Hi

my waste holding tank its almost full, so i tried to use the macerator pump to dump the waste but nothing comes out of the discharge pick, I can hear the pump but nothing. Any ideas of what may be the problem?

thanks

william
 

Lyle29464

Lieutenant
Joined
Mar 10, 2009
Messages
1,261
Re: macerator pump not dumping.... suggestions?

some pumps are hard to prime. If yours can be lowered to gravity feed that will take care of air leaks and get the impeller wet. then it should go unless the impeller is bad. If you have a 3 way valve be sure it is pointed the correct way. If you can fill the tank with a hose most likely the valve is not set to pump out. I have my pump at the bottom of the tank. pumps push real good. they pull not go good.
 

elvaktran

Cadet
Joined
Aug 20, 2011
Messages
6
Re: macerator pump not dumping.... suggestions?

well mine is above the fresh water tank, that is installed above the waste tank, so that may be the problem, I will try to set it lower to see what happens.
thanks man
 

Fireman431

Rear Admiral
Joined
Sep 17, 2007
Messages
4,292
Re: macerator pump not dumping.... suggestions?

Could be a couple of issues. First, if you are dumping thru the macerator, please tell me you are >3 miles from any shoreline (it's the law).

There should be a ballcock valve at the brass thru-hull valve. Is it open?
More than likely, there is a blockage between the tank and the macerator. If the tank hasn't been pumped out in a while, toilet paper and... *ahem* ...stuff can solidify and easily block the pipe between the tank and the macerator. The only ways to fix a clog in the pipe is:

1) Go overboard with a garden hose. Open the seacock and back flush water thru the discharge port. Don't run the macerator, you just want to try to stir everything up a bit :)eek:). Then try the macerator again.

2) Pump out at a fuel station, flow ample fresh water back into the tank thru the waste pumpout port, run the macerator and discharge the fresh water. Repeat.

If using an onboard head, it's always best to empty the holding tank at the end of the day/weekend. Also make sure you use nothing but marine toilet paper. It will break down to nothing when in contact with water whereas regular toilet paper becomes giant wads of paper mach?.
 

Lyle29464

Lieutenant
Joined
Mar 10, 2009
Messages
1,261
Re: macerator pump not dumping.... suggestions?

with a pump that high you can take a hose off and put some oil on the impeller. that will help a bunch.
 
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