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Old 08-17-2011, 07:39 AM   #1
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Fuel Smell

My YJ has a very heavy gas smell when I leave it in the garage overnight. I have posted this on the ďotherĒ Jeep forum and the feedback I have gotten seems to be my carb; it isnít. There is no moisture that I can find anywhere on the carb or itís surrounding areas.

I was told by the PO that I have to pump the throttle ten or twelve times then hold it to the floor to start it. I have tried this and it is terrible. I decided yesterday to not touch the throttle and just turn the key. It starts right up after a few cranks; evidently I was an idiot to listen to the PO. Originally I though the carb was bad due to having to pump it so many times to start it; it was just operator error.

I have eliminated the carb from the suspect list but canít seem to find my gas smell problem. It is so bad that the entire garage stinks after it is in there a few hours. I did check the roll over valve and it appears to be good and the lines are all hooked up. Someone suggested checking the gas tank lines; I am being lazy and donít want to drop the tank unless it is absolutely necessary.

Do any of you have any ideas or have you has similar issues with yours?

I am taking it to the shop on Saturday; unfortunately I really, really hate paying someone to do work for me. I am just stumped on this one.

See ya,

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Old 08-17-2011, 01:27 PM   #2
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The filler neck tubes, or the lines going to and from the mechanical pump are likely dry rotted.

As for starting a carbed engine with a working choke, pump the pedal once or twice then crank it. It should fire up in about half a revolution if the carb was primed.

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Old 08-17-2011, 01:31 PM   #3
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The first thing I would do is to change the fuel rubber hoses at the filter going into the carb. On my 89 I had the same odor problem but no leaks. What I did have was a cracked hose the was almost invisible but enough to cause an gas odor problem. I changed the 3 rubber hoses at the carb and no odor. I would also check all of your fuel lines and hoses. Also check your rubber fill and vent hoses. They also are prone to cracking. I replaced both of mine and didn't have to drop the tank. I just had to remove one piece of the left rear wheel well plastic housing which only required taking off three plastic screws.
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Old 08-17-2011, 09:05 PM   #4
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I had a similar problem with my 87, whenever I stopped I would get a raw fuel smell coming from the rear of the jeep. Turns out it was the gasket between the tank and the sending unit. Dropping the tank was not fun, but I had to do it to change the skid plate anyway. And now there I don't get have any problems with fuel vapors.
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Old 08-17-2011, 10:00 PM   #5
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I too was getting a heavy gas smell then a gas drip at the back of my 95. Had to drop the tank and replace the filler, vent, supply and return lines along with the rubber lines on eather side of the fuel filter. My leaks were all on the supply line but all the lines were in bad shape. The rubber supply and return lines were soft like a sponge, think it may be from the 10% Ethanol in most of the gas around here. Now trying to buy only !00% gas. The filler and vent rubber tubes were hard and starting to crack.
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Old 08-17-2011, 10:44 PM   #6
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Check the lines going to the charcol canister
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Old 08-18-2011, 12:32 AM   #7
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Quote:
Originally Posted by goatman View Post
The filler neck tubes, or the lines going to and from the mechanical pump are likely dry rotted.

As for starting a carbed engine with a working choke, pump the pedal once or twice then crank it. It should fire up in about half a revolution if the carb was primed.
My '98 Ford Mustang had that issue, except whenever I'd take a left turn, some fuel would leak out of the gas tank. And if you stood next to it, it overwhelmed you with the smell of petrol.
Replaced the fuel filler grommet (For the Mustang, just a simple rubber piece), and no more smell / leak.
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Old 08-18-2011, 07:09 AM   #8
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Thanks for the input. New fuels lines in the engine compartment this weekend and if worse comes to worse I will drop the tank and check all of those lines and the fill neck. I want to undercoat the tank and holder so it is as good of a time as any I guess.

Thanks again for the feedback!
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Old 08-18-2011, 02:39 PM   #9
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What year is your jeep?, my tank plastic, the skid pan is steel
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Old 08-19-2011, 07:25 AM   #10
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What year is your jeep?, my tank plastic, the skid pan is steel

It is a 1990; I was assuming that the fuel tank was metal?

$150 for piles of fuel and vac lines (plus full tune up stuff and oil change). One way or the other the smell has to go away this weekend.
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Old 08-19-2011, 09:03 AM   #11
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My fuel filter was rusted and weeping fuel.
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Old 08-21-2011, 05:49 PM   #12
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I had a similar problem with my 1990 YJ. Turned out to be the fuel cap (probably the original and the gasket was all dried and cracked)

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