went to a job today sewer ejection pump in basement not working, when i plug the pump in it starts to pump i can tap on the 2" discharge line and it is full the water level in the tank drops a little but only about a 1/4". unplug the pump the line drains back in to the tank the water level rises a 1/4" and tap on the discharge line and its empty.so i know the pump is pumping some, i also know the check valve is bad and i thought the line maybe plugged so i snaked it to the 4" main clean out only abot 12' away and still nothing. there is only about 5' of rise. the only thing i can think of is that the pump is tired? it looks like its pretty old. what do you guys think?
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help with sewer ejection pump