Hi my name is mike and I'm new to the forum. I want to thank anyone in advance for any help they can provide.

I just installed a utility sink pump system in my basement to add a sink next to my washing machine. The washing machine currently drains to a raised standpipe with no problems.

I believe I have vented and installed the pump system correctly. I have no leaks and the pump seems to turn on and off correctly. It turns on and runs for like 10 seconds and then turns off.

My problem is this. When it first turns on, it causes some water to overflow out of the standpipe.

Any suggestions? I will provide some pics if anyone is willing to work with me here.

Thanks for any help.

Post some pictures of how things are connected.It'll save time in the long run.

OK here are some pics. The pipe on the left that is coming out of the black box is the fluid discharge. I have it running to the standpipe where my washing machine has always drained. You can see I still have my washing machine and a flexible drain line from my water softener still running in to it. Both of those still work fine without causing any overflow.

The pipe on that is coming out of the black box on the right is the vent. I have it tied in to the vent stack that goes up through my roof.

cut a 3 x 2 "Y" into the 3" main drain line. tie the pump discharge into that "Y". no trap needed at that tie-in point. the trap goes under the new sink and the vent for that trap ties into the vent stack 6" ABOVE the point the washer drain is vented into.
also, you need a check valve on the tank outlet, just above the tank.
vent does not need to be 2" as shown here. 1 1/2" is adequate.

Very nice, thanks.

So as I understand it, I can forget about draining to the standpipe and just tie the 1 1/2 inch discharge from the pump directly to my 3 inch drain pipe? I like that idea a lot.

What about how I am tied in to the vent stack? Is that ok?

I am also going to add a check valve just above the union on the discharge pipe

you are tied into the vent stack too low. the tie in point must be at least 6" above the top of the standpipe.

Thank YOU!

I don't understand why I need the 6 inches, but you are 100 percent correct. I found a very clear sentence in the NJ plumbing code stating that requirement.

Thank you very much for your help.

because if the drain backed up you would then have sewage in the vent which could cause a blockage in it

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