Nolan you know what? I think I might have had this issue as well. I vaguely remember the countersunk bolts for the adapter were too long and bottoming out in the intake. Any possibility you're having same issue?
We bought the whole "kit" from afi including the electronic distributor they supplied. At the time the fuel pump they supplied came with a half inch outlet barb which we couldn't find a reducer for anywhere. Ended up having to use a couple of adapters just to hook a 5/16 hose to it. I believe...
Until you drive a diesel lol. I installed an afi kit on an fj40 a couple of years ago. I really hope yours works out better than mine did. It was an absolute nightmare for me to diagnose and work out all the kinks....which I eventually did and it wasn't too bad after that.