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Old 09-03-2016, 09:33 PM   #1
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Noisy Flo-Jet 18555-000A,

So I go and buy a brand new Flo-Jet macerator pump, the kind that attaches to the bayonet fitting on the drain line. It's noisy, period. I ran it in the shop just to make sure it would work and it was noisy. Then I attached it to the camper, which the tanks was dry, ran it and it was noisy. So I hooked a hose to the camper potable water line, ran water in the black tank through the toilet and tried it again. It was noisy. Those that know me will tell you that I will take something apart in a heartbeat. That's about how long it took me to take this pump apart. Voila, I found the noise. These pumps use a flexible rubber impeller running in asymmetric cavity. That little rubber impeller sure makes a lot of noise. I removed the impeller, put the pump back together and it was so much quieter. But it won't work like that so I put it back correctly. Did I get a bad pump or are they all loud?
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Old 09-05-2016, 10:24 AM   #2
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Those pumps are designed exactly like an outboard motor water pump.

I watched a couple of Youtube videos of macerator pumps and they seemed pretty noisy. Are you sure that it was the impeller making the noise or could it have been the chopper blade?

Have you thought about contacting the mfg. of the pump and seeing what they say about it?
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Old 09-05-2016, 10:40 AM   #3
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They are very noisy - that's just the nature of the beast. You're only going to be running it for ~5 minutes anyway.

You try chopping sewage and pumping it through a garden hose and see how much noise you make

I wouldn't be without mine... use it every trip >2 days to pump grey water into a tank in the back of the truck to drive it to the dump station. Also to do final flush to my septic system during winterizing.
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Old 09-05-2016, 11:42 AM   #4
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I took the pump apart down to the rubber impeller, removed the impeller then ran the pump. Quite, very quiet. Then I put the rubber impeller back in and ran it. Very noisy, but then again I had rubber rubbing against metal. It may be quieter with water running through it. I imagine I will be running this pump longer than 5 minutes, but not for extended lengths of time. I bought this pump so that after I get home from camping I can really clean out the black and grey tanks. Draining them at a dump station does not clean out the tanks very well, IMO. I have added a 2" tap to the line coming from the house to the septic tank with a fitting for 3/4 garden hose so I can pump it straight into the septic tank. So, IF it's noisy when I run it--so be it. I've also found out by reading on this forum that I can use the pump at the campsite to pump from the drain connection into the blue tank in the back of my truck. This will allow me to take the blue tank to the dump station without pulling it with the truck very slow, neat idea. And while we are discussing this pump: Would anyone share how they ran the wiring from the battery of the unit to near the dump valves? As of now I'm looking at running 10/3 Romex (household wiring as I have plenty) from near the battery to near the dump valve, something like 25 feet. I will run stranded 10/2 from the Romex to the battery and use the same from the Romex to near the dump valve. The end near the dump valve will have a flat 2 wire connector to hook up the pump.
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Old 09-05-2016, 05:22 PM   #5
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My standard for 12v connectors is Anderson Power Poles (this picked up from the amateur radio world). Besides RV stuff, I also have a lot of astronomy gear that runs on 12v so virtually all 12v stuff plugs together with these connectors. I have a pigtail with this connector on my RV'S battery and various lengths of extension using 12ga low-voltage landscape lighting cable.
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Old 09-10-2016, 04:23 PM   #6
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Well, I found the problem and fixed it. After disassembling the pump multiple times it suddenly hit me, check the impeller clearance. After measuring the impeller thickness, the gasket's (2 PC.), and the impeller housing thickness I found that the impeller was bound up. Oh, I'm a retired machinist with pump repair experience. By adding feeler gauges to the top of the last gasket I determined that I needed .007" more clearance. I had some .008" gasket material so I used it. Bingo! Run dry the pump was a bit quieter then ran hooked to the TT's drain with water in the tank it was much quieter. I had a good stream coming out with the end of a 50 ft. hose held about 6ft. high. The pump is ready, I have a tap on my septic system ready, so all I need now is a dedicated 12vDC line near the drain valves. Give me a day or so.
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