it's been awhile since i ran a setup with external regulator, but I believe i made a block off plate for to replace the original regulator then the return line from TBI to went to the inlet on the external regulator and then return line to the tank hooked up to the external regulator outlet. supply line stays the same. the popular regulator was an Aeromotive 13301. i have my one from 10 years ago thats been sitting in a box lol
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