So we are guessing that your problem is loss of prime on the intake side. I'm certainly no expert on centrifugal pumps other than owning a cottage with one, but do know they can be frustratingly infuriating sometimes. ABS/PVC cements are solvent cements and 'cure' within a few minutes maximum. Assuming you used the correct cement on clean joints I don't think that is your problem. Do you have a foot valve? Is it clear? Are you within the maximum lift for the pump (normally about 25')?
Other than that, everything looks new. Wait for others to chime in.
Other than that, everything looks new. Wait for others to chime in.