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Old 01-12-2017, 10:45 AM
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Evaporative Emission Control System Leak Detected (gross leak)

Evaporative Emission Control System Leak Detected (gross leak)
anybody experience this code before? Ideas on what to check?


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Old 01-12-2017, 11:13 AM   #2
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Originally Posted by Geezer01 View Post
Ideas on what to check?

The fuel cap should be high on the list.

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Old 01-12-2017, 12:30 PM   #3
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My Jeep alternates between small and large leak. I found a line snapped off the white valve between the evap canister and the body. I plugged the line to the tank so not to get water in. Going to result in me having to drop the tank and replace that cluster of hoses which I haven't had time to do.

check that your gas cap is tight, check the vent line to the fuel filler neck (toward the top between filler neck and body), check the connections at the evap canister (right rear wheel well behind fender liner, also check connection at your intake manifold. There should be a small purge valve on the left front inner fender with a line running to the intake manifold. If those check out, the leak may be the small line at the LDP pump, there are two connections near the front left of the gas tank where your fuel line and fuel pump connector are, or it could be lines on top of the tank. Lots to check on them.
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Old 01-13-2017, 10:53 AM   #4
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If it's not the gas cap. Take it and have it smoke tested. It will save a lot of wasted time.
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Old 01-13-2017, 12:32 PM   #5
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When my 2002 had that code (maybe it was a medium leak), it was due to the vapor line that runs between the fuel tank and the charcoal canister. The line is steel and runs along the driver's side of the frame (along with the fuel and brake lines). Where it tucks up behind the rear shock, the line had rusted out causing the leak. It was an easy, $30 fix to replace the steel line (there are just rubber hoses that slip over each end). I didn't even bother to remove the old line, I just zip-tied the new line to the old one.

Anyway, evap leaks seem to be pretty common with the older Jeeps and there are a few things to check, the vapor line being one of them. At the very least, I would give the whole system a quick once-over before taking it to a mechanic. Could be something simple.

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