Great tips! I like that PST design, I have not seen it before

For me, I try to keep the suction side from the UAT to the pump as short and straight as possible. I have noticed that certain types of fuel line, when used with a relatively tight bend from the UAT feed line can (over time) develop a suction leak at the UAT feed nipple.

Also, I do not use any festos on the suction side, and use large fittings made for garden sprinkler systems. And make sure the vents are huge and do not constrict at the single vent. It would also be a good idea to have any parallel tanks that feed into a header to each feed directly into the single header as opposed to going to a "T" fitting then going to the header.