Alright since i have figured out that my fuel pressure stays on 0psi i think its time for piston pump. im going to yank the stock pump and spacer off of my 95 parts truck.(hopefully the pump is good), going to go ahead and do 3/8 all the way. i red that the threads are 1/4 mpt into the piston pump but what size are the threads on the out side of the piston pump. also if i can find a simflo regulator what kind of threads do they have? also i see that i need a 90 bend coming into the piston pump but what are yall using coming out.

 

14mm X 1.5 Threads output on pump.

I used a 45 degree 14mm x 1.5 - 6AN male adapter going to a 6an female - 45 degree barb/pushlock

 

So the injection pump and filter housing are 12mm 1.5 and the piston pump out is 14mm 1.5 and into the piston pump is 1/4 mpt