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Boulderv7 09-21-2008 05:46 PM

evap leak
My jeep just spit out the code p0455- large evap leak detected. What does that mean, and how should i go about fixin it? Thanks for the replies!

Jerry Bransford 09-21-2008 05:49 PM

Check for a loose gas cap. That code can be set anytime by the gas cap being off or loose when the engine is running. If it's not that, you might have a cracked or damaged fuel filler line or fuel filler vent line hose.

Boulderv7 09-21-2008 09:25 PM

thanks... probably loose gas girlfriend filled her up last night and probably didn't tighten to 3 clicks.

MOz 09-22-2008 07:18 AM

x3 - I had this happen just last week after filling up. Re-tighten the gas cap.

rrich 09-22-2008 11:51 AM

The light should go off immediatly after fixing the cap. If not, it should after the next 10 miles or so.

If not by then - open the hood.

Look closely at the "stuff" on the left splash panel, almost under the brake booster.
Find a small "TEE" in a vacuum line with a cap over it.

Remove the cap, put a longer hose on the Tee - maybe 2 or 3 feet.

Engine off - blow cigarette smoke in that hose - a big puff.
Look for where the smoke comes out - fix that! It may be close by or underneath.

That's the evap system access - it's supposed to be sealed.
If you've done any work near there, or under it, a line may have been knocked loose. Or sometimes a bush or debris gets kicked up underneath and severs a line.

IF - you can't find any leak, then follow the procedure in the factory service manual for that code.

Or - do a Google search for the procedure.

But --- I've never had to go further than the smoke test.

After fixing the leak the light should go off - at least within 10 miles.

Tip - For those of us that are afraid even one puff will get us stared smoking again.
Use a big turkey baster - suck the smoke in that, then shoot it into the Tee. Works great!

(After a few days, smell the turkey baster - YUK! How could we have enjoyed that so much?)

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