when installing aem fpr what kind of fressure should i run WITH 720CC PRIM 1k sec. injectors and venom 255lph pump for about 12 psi of boost

 

Unless you have an aftermarket programmable EMS, you should stick to the stock 37psi static fuel pressure. If you do have one, you can bump it up a bit to 40-45psi. Whatever you do, changing the fuel pressure requires a full retune of the fuel maps.

 

40psi is the most common fuel pressure people run (that's without the vacuum source connected), assuming you have a computer that can compensate for it. That's what I've got for my 720/1680 setup.

 

so my 255lph pump will not cause pressure to rise in rails with stock fpr

 

a higher flow pump won't make a difference since the fpr keeps the pressure in spec.(40-35 psi).you can even get a bosch 300lph pump and it will still stay at the same pressure.