Well Pump Overheating, Blows PVC Fitting: Suction Air Leak or Pressure Switch

4-year-old pump, bladder tank, ~125 ft, whole house. Overheated, blew PVC fitting (pump to tank). Replaced, ran 1.5 days, blew again. Motor casing extremely hot, fitting soft/ballooned. Still pumps water.

Two Causes

1. Suction side air leak: "Either the suction side of the pump is drawing a little air."
2. Pressure switch not shutting off pump: "Or your pressure switch is not shutting off the pump correctly. The pressure switch can work intermittently so I would change it while you're doing the other repairs. They are less than $20."

Finding Suction Leak

"Apply pressure to it, air or water. Then apply soapy water to all the joints and watch for bubbles."

Overheating + blown fitting = pump running continuously (dead-head or near dead-head) due to switch failure or inability to build pressure due to air leak.