[RandyP]

If you have an 86 and someone has converted it over to TBI there is no real telling where the issue is they might not have put a fuel pump in both tanks or replaced both tanks with TBI tanks or it might have an inline fuel pump instead which is simpler when converting them over so first thing you need to do is figure out the fuel delivery setup and see if you're dealing with two fuel pumps or just one or maybe one tank is simply not hooked up since it was made for a carb and is now running TBI or it could be something as simple as a switch on the dash not letting it switch from one to the other for sure you will have to get to the basics first and expand out sometimes is more of a problem finding the problem than fixing the problem let us know what you find