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Old 07-14-2017, 04:12 PM   #11
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If your vacuum pump is running while not in use you have a leak that needs to be addressed.

My bilge pumps are hard wired to the batteries so when not on the boat the battery switch is off and so is the vacuum pump.
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Old 07-24-2017, 08:38 PM   #12
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I have a 2001 2900 SCR, I don't have a on/off switch for my vaccuflush toilet. I was kicking around the idea to add one, there is a switch in the head that is not being used.
Hello! I have a 2001 2900 SCR too. My on/off switch is down in the engine compartment on the plastic vaccuflush pump that sits atop the waste tank. I have a leak in my vaccuflush pump so have to manually turn it on & off or listen to it "pump" every 3-5 mins. Planning to wire it to the extra switch in the head that you mentioned. (Btw, I was told that switch is actually for a shower sump).

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Old 07-24-2017, 09:51 PM   #13
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Correct red rocker switch in the head is for the shower sump.
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Old 07-25-2017, 12:58 PM   #14
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Hello! I have a 2001 2900 SCR too. My on/off switch is down in the engine compartment on the plastic vaccuflush pump that sits atop the waste tank. I have a leak in my vaccuflush pump so have to manually turn it on & off or listen to it "pump" every 3-5 mins. Planning to wire it to the extra switch in the head that you mentioned. (Btw, I was told that switch is actually for a shower sump).

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Fix the leak, not the work-around. The switch isn't your problem.
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Old 07-25-2017, 05:19 PM   #15
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Nauti, does your head hold water or does it leak down? If it leaks down it's an easy fix to replace the seal on the flush ball.
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Old 07-25-2017, 06:47 PM   #16
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Correct red rocker switch in the head is for the shower sump.
Hmmm, no red rocker switch in my head, just two little white rocker switches to left of sink....one controls lights & the other does nothing so gonna wire to that one. There is an electrical outlet under corner cabinet that looks like it may have been an after-market type thing...wonder if that's where the red rocker switch used to be? The only RED rocker switch I have in cabin is for water - just in front of galley sink.
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Old 07-25-2017, 06:55 PM   #17
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Fix the leak, not the work-around. The switch isn't your problem.
Agreed but until mechanic can fix the vaccuflush pump leak I can at least use the switch to turn pump on/off instead of having to pull bench seat & open engine compartment every time I need to flush...
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Old 07-25-2017, 07:10 PM   #18
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Nauti, does your head hold water or does it leak down? If it leaks down it's an easy fix to replace the seal on the flush ball.
It holds water...holds so well that the first time I added water to holding tank the toilet overflowed because the flush ball flap was stuck!

HOWEVER, my mechanic says I have a leak in the waste holding tank in addition to vaccuflush pump leak. Could the pump leak BE what's leaking? Any suggestions on how best to fix those issues???
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Old 07-25-2017, 09:33 PM   #19
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Hmmm, no red rocker switch in my head, just two little white rocker switches to left of sink....one controls lights & the other does nothing so gonna wire to that one. There is an electrical outlet under corner cabinet that looks like it may have been an after-market type thing...wonder if that's where the red rocker switch used to be? The only RED rocker switch I have in cabin is for water - just in front of galley sink.
That second white one may be the shower sump pump, if there is no water in it the float is in the off position and the pump doesn't run. Try turning it on and pouring water down the shower drain to see if it comes on, may take a bucket of water to fill the sump.
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Old 07-26-2017, 01:34 PM   #20
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It holds water...holds so well that the first time I added water to holding tank the toilet overflowed because the flush ball flap was stuck!

HOWEVER, my mechanic says I have a leak in the waste holding tank in addition to vaccuflush pump leak. Could the pump leak BE what's leaking? Any suggestions on how best to fix those issues???

Head (Toilet) -> Vacuum Pump -> Holding tank.

Vacuum Pump only creates vacuum between the Head and the vacuum pump. There is no vacuum between the pump and the holding tank. If there is a leak in the holding tank, it would be unrelated to your problem. The holding tank has a vent line, so a vacuum cannot be created there.

If there is a leak in the holding tank, that would definitely need to be addressed. I would be interested in knowing whether it is a fitting, a hose, or if the tank itself were compromised.

As for the vacuum leak, it will either be the ball, or a fitting between the tank and pump, the hose between tank and pump, or the pump itself.

I believe those are diaphram pumps, so I would be looking there as a culprit.
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