Go with fass 150 or dtt assassin. The raptors and airdogs are having problems with their new stuff. I have an older fass 150 on my truck and its great 18-20 at idle and I cant get it below 14-15 psi wot throttle

 

Its time for me to get a lift pump too. I'm going with a DTT Assassin. They idle at about 14 psi and at WOT its about 20 psi... It goes up in fuel pressure with more throttle. Call Stephen at DTT, he answered my questions very quickly. FASS 150's as well as Airdogs have leaked from time to time and then you need to get another one. No issue with a life time warentee, but with the mechanical pump, the only thing to fail is losing a belt. They're $9 so carry a spare. Only need one wrench to reinstall it. Look around. I TRIED to find people who were either unsatisfied or had one fail... still cant find anyone..