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Old 06-28-2013, 06:25 AM   #1
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My 87 YJ Fuel issues?

Driving home from work my YJ acted as though I ran out of gas, and the fuel was low but could not get it restarted. Added fuel and still nothing turns over but would not fire. After several trips under the hood and trying different things, I noticed fuel leaking out of my muffler.... any thoughts?

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Old 06-28-2013, 09:28 AM   #2
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are you sure it is fuel and not water build up?

Did you smell it or touch it?

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Old 06-28-2013, 09:47 AM   #3
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Make sure you're getting spark. If not you could have a bad coil or Ignition Contol Module. If that all checks out, worst case scenario is that you have a bad timing chain. The reason fuel might be present in the exhaust system is because you probably cranked it alot and it never fired. That will happen.
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Old 06-28-2013, 10:16 AM   #4
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^ what they said.

If it is fuel, are you sure it was coming out of the muffler? Could it be dripping onto the muffler and running down it? Very dangerous by the way, don't run it with fuel dripping on the muffler, unless you are looking for a fireball.

Could have a leaky hose or tank that is sloshing over that way when you corner. I think there is a pressure relief/rollover valve near the muffler on some, if not all of the models.

If it is coming out of the muffler, Kik has put you on the right track.

If it isn't fuel, water in the exhaust is fairly normal (in small amounts, if a gallon pours out you have a problem). You may have a delivery problem. I'd suspect a clogged fuel filter or line. Maybe a bad fuel pump. Give the carb a sniff of starter fluid and turn her over, see if she wants to go. If it starts for a second I'd pull the line off of the carb (or fuel rail, if its injected) and put it in a bottle (not plastic) and have a friend give it a crank. If you have fuel pressure there its probably something in the return system. If that is clogged then your fuel lines will build up really high pressure.

May even be vapor lock try cracking the gas cap and starting it. Though in your OP you said you added gas and that didn't help so I doubt its vapor lock.

Let us know which model jeep you have and that will help diagnose it. Better yet fill out your Jeep profile.

Keep us updated and we should be able to help talk you through it.

Good Luck!
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Old 06-28-2013, 11:27 PM   #5
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Mine did the same thing. I replace the fuel filter and re bled NY fuel lines. Mines fuel injected so I'm not sure if it would make a diff. Do carbed jeeps have fuel pumps?
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Old 06-30-2013, 01:59 PM   #6
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Quote:
Originally Posted by cakes567 View Post
Mine did the same thing. I replace the fuel filter and re bled NY fuel lines. Mines fuel injected so I'm not sure if it would make a diff. Do carbed jeeps have fuel pumps?
Yes. Mechanical. Passenger side of the engine.
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Old 07-06-2013, 02:25 PM   #7
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On going ......

ok so I have checked most everything and decided to run a compression test and cylinders 1-3 checked out good about 120 psi but cylinder #4 almost pegged the compression guage and pushed fuel through the guage .... any thoughts?
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Old 07-06-2013, 07:17 PM   #8
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Did you check cylinders 5 and 6?


I hate to say it but it may be time for a rebuild or it could be a blown head gasket if your lucky or cam shaft issue is it making any noise and does it run at all with that much compression in #4 I would be cautious about driving it

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