Sorry I wasn't clearer. The motor that quit was a 1HP with, as it turns out, a 3/4 hp impeller. Took the impeller to the pool warehouse and proved that it was a 3/4 hp by comparing it part # and physically to a brand new 3/4 hp impeller.
Parts folks said they could see nothing wrong with impeller.

Pump is an Ultra-Flow and the diffuser is good from 1/2 hp to 1 1/2 hp. Both 3/4 hp motors exhibit same problem, high amps, high heat, cut out operates. Voltage while pumping is 238 at motor. New pressure gauge indicates 8 psi at filter.

We are trying to backflow suction lines. May have to find a pump to really get some flow in the lines as garden hose may not hack it.