Could the suction line simply be too high up for 1.5" flex PVC running back to the pool? I installed these 2" lines with the ability (hopefully) to hook them up to new 2" hard PVC when the next time we have to do major upgrades to the pool.



Or could a 70' 12 gauge run to the pump not be enough wire? Everything I'm seeing says that it is sufficient, but there's part of me that thinks it's just not enough.

The former is a PITA repair, but one that can be done. I pretty much have to trash everything I did, or use the inside 1.5" slips on the 3-way diverter valves I just bought. The latter is a $4000+ repair, as the main panel in the house needs to be upgraded before any electrician is going to run anything to the shed/pool.