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Modern sumps are plastic so it really depends on what you find below, you might find a lid that fits or can be made to fit but if the sump is rusted like the lid you will be into jack hammer work.
 
Yikes. I filled the tank with water in hopes that if anything was stuck it would loosen up and left the the pump unplugged. Went back down 45 min later and at least half the water was gone. Maybe its safe to assume the tank is rotted and leaking as well
Get it open and cleaned out and then panic. Then look for suggestions.
 
I bought that lid locally just to try. I knew it would be about 1/4" short for the overall diameter but I didnt know the lip on the bottom of the lid measures 18" and my tank is 17.75" so it wouldnt sit flush. I found a jackel lid that measures 17.75" for the lip so Im going to try that one.

The 4 existing holes on the tank have no threads. When the old lid came off the bolts were rusted and whatever type of threaded female adapter came out with the lid. Its just literally a hole and there is no concrete under the lip. Its just dirt. Im thinking maybe self taping screws through a new lid right through the lip with new holes.


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Can you post a close up of where you would like to have bolts for the lid,
 
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