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The setup is fine. The problem was the buildup of deposits in the discharge line for that pump (see photo).

Here's the actual problem.

There is a weep hole in the check valve connected to pump discharge.

Yes, I know that. In fact, my pumps sit on stands (each at a different level).

I'm asking for advise on a specific issue with this replacement pump. The system in place has been working perfectly for 20 years, keeping basement water free. My comment was in reference to the comment about some water always remaining in the sump.

Appears to be this: https://www.google.com/shopping/product/10665344685027837234?lsf=seller:8740,store:11529948128627207700&prds=oid:5263224737034856470&q=pvc+air+vent+valve&hl=en&ei=OZhtV-S6M8LteufRm8AJ&lsft=cm_mmc:Shopping-_-LIAs-_-D26P-_-100204205

Believe me, been dealing with this for 20 years. The higher pump is also AC and is .5 HP, the lower is .3 HP. We have a whole house natural gas generator so, no need for battery back up.

Check valve already has weep hole. Brand new. Spoke to Zoeller. The pump was working fine when disconnected from main line and with only check valve and 2 foot extension pipe. At the top of the vertical runs from the pumps, above the tee to horizontal runs, there are what appear to be two...

The pump size is fine. This is a direct replacement for older, same model. The entire pump was submerged and, the secondary, higher sitting, pump was engaged. Unplugged the secondary pump and let the new one run. It was running but, no discharge outside house. Check valve is in correct...

I just replaced my Zoeller M53 pump with a brand new M53 and new Zoeller 30-0238 inline check valve. Got everything back together and pump is running but, no discharge from outside line. Took apart main discharge pipe from the extension attached directly to the pump and check valve and...