Engine Need advice. 84 CJ7 I-6 140k ran good for a week after purchase. Fuel issue?
Ridge Runner
Jeeper
Need advice. 84 CJ7 I-6 140k ran good for a week after purchase. Seller said sometimes have to point downhill to get to start. So I'm thinking float bowl adjustment. Nope. He Nuttered it, best I can tell did right. Started shutting off on up hills then wouldn't start until sitting 10 min. Tried removing gas cap nope. Not overheating, blew out supply line it was fully open. Return line had to use a compressor but it worked but still has significant back pressure. Changed manual original fuel pump, pumps alot higher psi well above 15psi. Has clean 1 in 3 out filter with small line on top. Carb floods now runs rough & getting rougher after finally starts pours black smoke out tail pipe. Replaced carb with basic off Amazon. Same issue. Thinking vacuum lines or tank return not flowing good & guessing plugs are fouled now after all that gas dumping into intake. Previous owner put new plugs, wires & dizzy cap & button but that's it. Timing could be off as it was running little rich when got it definitely getting gas too much now. But ran good for a week, I'm stumped & went by 7 shops today. They all said don't work on carbs & pointed to a few old timers that do. Only 1 said he'd look at it in a few weeks. Would have to have it towed there. Any suggestions?