Just replumbed my lines as I redo my patio area. I put a 2" line for suction (used to be 1.5). As you can see in the attached picture, I temporarily ran the lines a couple of feet high out of the ground because the ground depth will change.
Anyway, I temporarily threw some elbows in just so that I can test the lines. The pump isn't priming though. Is it because of that large upside down U? I assume it is, but before I cut the PVC low to the ground (which I'd rather wait for the patio to be done before I do) I thought I'd check first.
If it is that upside down U, should I let the pump run for a while to see if it will eventually prime? I only tried a minute or so.