Sounds similar to my fuel setup. I had the AEM rail, regulator, and filter. Same pump too.

Honestly, I don't know much about the 18g. I never learned the turbos... :happysad:

If it's bigger than the 15g then I think it will hold 15psi. My buddy had a 15g and ran 12psi daily with it on a stock everything D16Y8 (except for RC 440s). Ended up busting the piston ringlands, but still made 240 whp. :shrug:

What boost controller are you using?