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Old 08-29-2018, 02:51 PM   #1
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Draining Grey Water Tank on Access Premier 26QP

2011 Access Premier 26QP
The macerator pump which empties the grey water tank, pumping water to the Black water drain outlet moves the water very slowly. Probably at about the same volume at from a tap using the 12 volt pump. In order to drain a full tank it would probably take at least half an hour. I have checked for a blockage at the shut off valve and pulled the plug after the shut off valve and there is a full volume of water there. Also the macerator pump cant draw water until there is about 3 inches of water in the bottom the tank and the outlet pipe is full(pump is higher than the outlet). Winterizing instructions are to run some antifreeze into the tank and through the pump. Not sure how many gallons would have to go into the tank before it would do any good for the pump. Would be interested to know if anyone else has encountered the same issues. Havent had this unit long so still working out the bugs
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Old 10-01-2018, 07:16 AM   #2
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Hi. I'm checking to see if you found a solution for the greywater pump issue. I now have the same coach, with the same question. All I can think of is to run the pump until it stops (loses prime), then drain the rest out the drain plug into a 5 gal bucket.
Thanks
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Old 10-01-2018, 02:33 PM   #3
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Gray water Drain

I have had no other replies to my post. The problem is taking so long at the dump station. Dont like keeping others waiting so long while I drain. Not even sure how long it would take to drain a full tank. I was going to check the hose from the pump to the black water drain to make sure there is no blockage. Havent got around to doing that yet. That would only effect the volume so still wouldnt solve the problem of getting a complete drain and totally emptying the tank. If I cant find a solution may be forced to putting a drain hose connection on the gray water tank. Means extra work but would speed up the process. I am surprised that my query generated no response. Had a Tiffin bus before the Winnebago and belonged to the Tiffin Forum and any posts there generated many immediate responses.
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Old 10-02-2018, 06:04 PM   #4
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Hello

Must not have been anybody here at the time you asked the question. I have no idea what your rig has mine not like that sorry I can't help you Ronnie
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Old 10-03-2018, 06:32 AM   #5
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Hello Tallmantwo

What year and model is your RV. Curious to know if the drain configuration is the same.
Thanks
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Old 10-03-2018, 08:15 AM   #6
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Hi Duffson

My reply was regarding winterizing - to pull the drainplug (beyond the shutoff), getting rid of the last bit of water. Then freshwater rinse, let that drain and call it good. Probably the hose at the pump would also need to be disconnected to make sure it is dry.
Still leaves us with the slow drainage issue. What about replumbing with a full size shutoff, elbow, coupling and cap - eliminating the pump altogether? Yes, it would require attaching the sewer hose to 2 places rather than 1, but it sure would be faster AND a complete draining instead of leaving some greywater in the tank to get nasty.

Ideas welcome...
Brad
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Old 10-03-2018, 08:31 AM   #7
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We have a 2004 35U Adventure
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Old 10-03-2018, 02:16 PM   #8
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Hi Captainbrad
It seems to me that the macerator pump should be capable at pumping a greater volume of water, at least the volume of the hose leading from the pump to the black water drain. Has to be others out there with the same model, does everyone have the same pump performance or do we have a pump or some other problem. Would like to stay away from replumbing the grey water drain if I can. For winterizing I did the same as you, pulled the plug and drained the tank completely.
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