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Mike R.
Mike R., Plumber
Category: Plumbing
Satisfied Customers: 2703
Experience:  20 years of plumbing experience, including high end homes and service work.
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My Zoeller under sink pump turns on but does not evacuate

Customer Question

My Zoeller under sink pump turns on but does not evacuate the tank. Check valve seems to be freely operating and vent and sink drain are open to air, so no vacuum block. could the impeller be separated from the drive shaft?
JA: Sometimes plumbing issues that that you think will be really complicated end up being easy to fix. The Plumber I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Plumber should be aware of?
Customer: The Zoeller unit has a history of the float sticking, or some condition that causes overrun. didn't do it the first year we owned it, but started later.
JA: Our top Plumber is ready to take your case. Just pay the $5 fully refundable deposit and I'll fill the Plumber in on everything we've discussed. You can go back and forth with the Plumber until you're 100% satisfied. We guarantee it.
Submitted: 11 months ago.
Category: Plumbing
Expert:  Mike R. replied 11 months ago.

Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Does the pump run or it just does not come on at all?

Customer: replied 11 months ago.
it runs. TESTED OUTDOORS, with a hose, but it seemed to cycle 'shortly'
Expert:  Mike R. replied 11 months ago.

Sorry for the delay. Our power went out for a few. So, does the plug have a piggy back plug? If you plug the pump directly into the outlet while the pump is in water does it work then? Without the float switch?

Customer: replied 11 months ago.
No piggy-back.
Expert:  Mike R. replied 11 months ago.

The float switch is built into the pump?

Customer: replied 11 months ago.
zoeller model 53/105
Expert:  Mike R. replied 11 months ago.

If you hold the float upside down and shake it does it turn on then?

Customer: replied 11 months ago.
That, I don't know. Right now, pump cannot seem to overcome the check valve?
Expert:  Mike R. replied 11 months ago.

Oh.....I thought you took it outside.

Customer: replied 11 months ago.
I did; put a hose in the drain and it seemed to cycle, but shortly?
Expert:  Mike R. replied 11 months ago.

I see. So you have to open it. Remove the lid and see if the float is getting stuck or possibly just failed. It is almost certainly something to do with the float switch. Either it is getting hung up or the switch needs to be replaced.

Customer: replied 11 months ago.
Even if the float was stuck, why can't the pump evacuate the tank?
Expert:  Mike R. replied 11 months ago.

It is staying on or short cycling?

Customer: replied 11 months ago.
Both; inside. It cannot evacuate the tank, outside, it seems to short cycle and doesn't empty the tank?
Expert:  Mike R. replied 11 months ago.

So, it was running inside but not pushing the waste out and you took it outside and it short cycles?

Expert:  Mike R. replied 11 months ago.

That may not be a big deal at all. Something jammed in the pump or piping. You are still going to have to remove the lid to check it out.

Customer: replied 11 months ago.
Did that; vent is open, sink is open, check valve is free, now what?
Expert:  Mike R. replied 11 months ago.

So you have run the pump without the lid? Shook the float?

Customer: replied 11 months ago.
If the sink is open, but the vent might be clogged, what could be the problem?
Expert:  Mike R. replied 11 months ago.

The vent cannot be clogged if you have it outside. Did you remove the lid, fill the tank and run it without the lid and shake the float?

Customer: replied 11 months ago.
I ran a hose into the sink trap, venter open to air, discharge unimpeded, all worked well.
Expert:  Mike R. replied 11 months ago.

Did you remove the lid or no?

Customer: replied 11 months ago.
No
Expert:  Mike R. replied 11 months ago.

That is what has to happen. Remove the lid and check to see if the float is hung up.

Customer: replied 11 months ago.
Okay, but how do you explain t he sump tank doesn't empty?
Expert:  Mike R. replied 11 months ago.

Is the pipe full of water ?

Expert:  Mike R. replied 11 months ago.

How did you get the water out when you ran the hose in it?

Customer: replied 11 months ago.
Discharge was normal; while outdoors, but failed indoors
Expert:  Mike R. replied 11 months ago.

Is the pipe full of water ?

How did you get the water out when you ran the hose in it?

Customer: replied 11 months ago.
I ran the hose into the sink trap; the vent may have failed due to excessive back load
Expert:  Mike R. replied 11 months ago.

No. The vent is not the issue. Is the discharge pipe full of water above the check valve? How did you get the water out after you ran the hose in it?

Customer: replied 11 months ago.
the disagree above the check valve was obstructed, but after clearing/draining it, it still can' t evacuate the tank?
Expert:  Mike R. replied 11 months ago.

How do you mean? Does the pump run or cycle?

Expert:  Mike R. replied 11 months ago.

I made an offer to talk on the phone.

Customer: replied 11 months ago.
The pump runs, short, and stops.
Expert:  Mike R. replied 11 months ago.

The float is either sticking or there is a blockage in the discharge pipe or the float is failing. You are going to have to open it or remove the check valve to investigate. It is certainly one of those things.

Customer: replied 11 months ago.
The check valve is clear and freely operates, the vents are clear, the pump does not evacuate the tank.
Expert:  Mike R. replied 11 months ago.

If you do not want to talk on the phone then I will have to opt out. Would you like to talk on the phone about it?

Expert:  Mike R. replied 11 months ago.

I will have to opt out. I am logging off for the night.

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