highrpmsbc
Newbie
I have a cj7 with a sbc swapped from a 80-90's gm truck with the tbi unit. My issue is that it runs fine as long as it is bellow 3/4 of a tank. When I go to fill it up it will shoot black smoke and wont run unless WOT. Also when it dies gas poors out onto the ground from what looks to be an overflow hose/tube in the engine bay. Sorry if its a simple fix I haven't had any experience with tbi's before only carbs.