I apologize but im a new jeep ower and since im starting my rebuild im sure I will have alot of posts. my jeep a 78cj5 with 304 in it. I notice with the top down there is alot of exhaust smell when driving? the exhaust from the headers back is new, ive crawled it and dont see any holes or leaks. ive owned two classic broncos and never had that issue so im wondering if its because the exhaust pipes dont go out to the side or all the way out the back?
I double check tonight but I beleive they stop before the rear gas tank. I know that they dont exit out past the rear of the vehicle. I double check that, and maybe I need to add some pipe and exit it out the rear sides thanks
If they just dump out the back or under the Jeep, the fumes will just get sucked back into the Jeep because of the aerodynamics of our box like vehicles. It's the same reason all the trail dust gets pulled back into the interior.
Also, make sure your gas tank vent is hooked up to the vapor canister. Too many people assume that if it's an emissions device, it is evil and must be eliminated. Not so. All the vapor canister does is pass the fumes through charcoal to eliminate the smell and then pass the fumes back into the carburetor to be burned up instead of stinking up the air. It does not affect the performance of your Jeep. It actually ENHANCES the "chick magnets" that are buried deep inside the chassis. (Little known fact)
I'd rather be lost on the trails than found at home!
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Checked today the pipe(single pipe) exits about 1inch dorectly out the back towards the bumper? I'm guessing that's what's causing the smell? Would it help to have the pipe exit the drivers side behind the rear tire?
My 75 stinks of fuel every once in while. Like you I have searched for fuel leaks, etc. Exhaust runs out the back as pictured above, cept mine doesn't come out quite as far. It's even with the body. My vent is hooked up to the canister etc. I also have the OEM vented gas cap. Still I smell fuel every once in a while. I traced mine to the exhaust and a rich running TBI system. Could be your carb is rich and fumes are coming from the exhaust.
If you're smelling exhaust with the top up, etc. I wouldn't be looking at the charcoal canister, I'd be looking for an exhaust leak.
If you're smelling fuel with the top up, etc. I would be looking at the charcoal canister plumbing (and gas tank, and fuel supply lines). There are about 1 brazillion threads on the forum about how to chase down fuel smells involving the canister.