Gas leaking out exhaust manifold?

[txcougar]

I hope you guys can help us out. My brother in law has an 83 Buick Lesabre with a 307. He claims iIt appears that gasoline is somehow leaking out the exhaust manifold and it has been terrible on gas mileage since he bought it a couple of weeks ago. He's also smelled gas coming from the engine compartment at times. It seems to be running okay other than this leaking gas and it only seems to leak when he first starts the engine? Hope someone can help.

[comp]

FIRE HAZARD!!!!!!!!!! check to see if that cyl. has ,, spark(carefully),
has compresson, plug fouled?

[Hypsi87]

There is no way that enough unburned fuel is in his exahust. It would just explode. I would check the carb. something is probabally wrong there

[comp]

for safety i never tell anyone "no problem/don't worry" i don't know what
the persons mech. abilitys are, better safe than sorry, old but true

[tomminajar]

Originally Posted by txcougar

I hope you guys can help us out. My brother in law has an 83 Buick Lesabre with a 307. He claims iIt appears that gasoline is somehow leaking out the exhaust manifold and it has been terrible on gas mileage since he bought it a couple of weeks ago. He's also smelled gas coming from the engine compartment at times. It seems to be running okay other than this leaking gas and it only seems to leak when he first starts the engine? Hope someone can help.

If Gas was leaking out Exaust manifold I doubt your brother in law would be around to tell you about it-

I am guessing you have an Electronic Q-jet . 3 guesses off top of my head - ALL FROM Experience - Is there black smoke out off the tail pipe (soot) ? Check the check valve on the Charcoal Canister you might be sucking gas right out of carb- /Ground the ALDL -turn ignition on- You should hear a rapid Clicking from the top of carb-if not the mixture controll solinoid is stuck- /

Is it hard to start first thing in morning ? Allmost all Q-jets leak after a few decades from the plugs in the bottom of the float bowl flooding the intake w/gas and emptying the float bowl- And don't forget to see if the float is stuck - If you find someone old enough to know what he's doing he can fix the q-jet (rebuild it in a hour) Don't go buy one fro the junk yard if you can find one- Rebuild the on you have

Good Luck , Tommy

[txcougar]

Well my b-i-l is wtill alive and it was leaking out the exhaust manifold. Bought a carb kit and that took care of the prob.