I think the factory fuel return lines coming off the front of the head are -4. Correct me if I am wrong.
Billy T.
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Billy, you're right. I had changed mine to 3/8 so I had a brain fart. The fitting in the head is 1/8"NPT to -4 hose end.
The regulator fitting is #6 o-ring boss male to AN-4 male to the return hose from the head. I used 90* fittings here.
The hose line return from the regulator to the tank is #6 o-ring boss male to hose barb (whatever hose size you use. I used a 90* fitting here also.
At the hydraulic shop you ask for #6 o-ring boss male to -4 JIC male.
Don't forget the #6 o-ring boss o-rings, you need three.
The Aeromotive regulator uses two tapped holes to mount it. The bracket doesn't extend past the regulator body so there is room for the 90* fittings. I made my own straight bracket as short as possible instead of the provided one.
So, the two return line fittings I oriented down and the hose barb fitting was oriented to the drivers side. The regulator was mounted horizontally off of the rear bolt on the passenger side of the HPO reservior.
The return port is the one in the center.
There also is a 1/8"NPT fitting in the regulator. You can either plug it or install a fuel pressure gauge here. I suggest the gauge. Aeromotive 15633 is the one I used, it hasn't yellowed yet unlike some that others have used.
I realize a picture would be worth a thousand words but the Bean's fuel system is now in my buddy's truck.