Noob with a new mx5 Saturn build.

[Ianr]

That sounds about right. Mine uses the MX5 pump sender with flow and return pipes. I also use the MX5 filler and my 8mm top pipe connects to an 8mm hose with a non return ball valve the hose then loops down to the bottom of the car rather than finish in the boot area. Passed IVA with that system Oct 2016 and been ok on the road since