A little pre checking and sanding etc, double coat both sides, use Christy's Red Hot Blue Glue, never had an issue.
One step stuff that works great.
I figure 1200gph and 12 ft of head, and another with 10ft head and 4000gph ought tell if it works.
Other things about leaks: make sure you have no tension between the pre checked fitted parts.
Give the pipe parts some twisting(1/4-1/2 turns etc), use flex PVC tubing (Ribbed, sold at Home depot in 1/2, 3/4, and 1" sizes, perhaps more) where you can to reduce elbows and to reduce tension, pump vibration, use Schedule 80 when you can etc.
If the parts are pricey, like ball valves, unions etc, use threaded parts(you can take these apart later if need be).