Hey posted on here previously i was having trouble with my 4.3L TBI merc......I had a mechanic look at it and he determined my fuel regulator is stuck wide open. The current fuel regulator is not EASY to get too, so i was wondering if i would be able to purchase and use an external aftermarket one to run my boat?! My mechanic is a close friend (car mechanic tho) he figures i can go external we are just unsure what would be good........if we can!?