"Chris (SilverUnicorn)" wrote in message

The water level in the pit is low, but high enough to trip the pump.
That's fine the pump starts, and pumps out some wayer ( needs to go 7'
vertical than out the discharge).

Problem is, that 7 feet is enough to empty the pit enough so the pump
shuts off. I can only assume the check valves don't work, because the
pit fills up enough again to restart the pump. This happens every 2
minutes or less.

Can you adjust the float for a longer distance? If not, get a better or
second check valve in the line. It may also be crud it is picking up in the
sump and not allowing the check to close properly.