The impact of tubing sizes

[Cathar]

Okay, so we accept that the suction side of the pump is a bad place to be installing a quick-fitting. I'm assuming that this is where the bulk (all?) leaks occur?

Would a viable solution be to plumb all positive pressure routes in the system with quick-fits, and the final section into the pump which is subject to negative pressure with regular barbs?

Would that provide an amenable work-around? Pumps do like to have minimal restriction leading into them too, so a system that was all 3/8", but for the final run into the pump, use a 1/2" ID tubing section over barbs there.

Just thinking along he lines of horses for courses. Use quick-fits where it's suitable to use them, and use barbs for the small sections where they are more appropriate.