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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 10-19-2005, 06:29 PM   #1 (permalink)
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EVAP capillary leak

OK experts, what is the EVAP? I've been having oxygen sensor adaptation errors recently and I'm wondering if the EVAP is short for "exhaust vacuum...[something something]". I somehow doubt it has anything to do with the A/C evaporator.
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Old 10-19-2005, 07:45 PM   #2 (permalink)
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Evaporative emission(EVAP)
The EVAP system's task is simple. Store the vapor created in the vehicles fuel tank, and allow it to be burned in the combustion process when commanded to do so. Why? Again simple..fuel in the fuel tank, the vapors from the fuel is a form of vehicle emissions.Only cars equipped with an OBDII system are alsso equipped with EVAP.
Hope it helps. Z.
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Old 10-20-2005, 11:02 AM   #3 (permalink)
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OK, that clears up what the EVAP is, thanks Zibby. Next question would be what would cause an EVAP leak? Right now, the leak is listed as a "capillary leak" in my computer. I've read some comments that this is caused by the grand ol' gas-cap conundrum. Anything else I should check along the fuel lines that would cause such a small leak?
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Old 10-20-2005, 02:58 PM   #4 (permalink)
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In my experience, I would look primary on a gas cap, even if it visually look normal sometime it cause trouble.My friend had simmilar problem on 2 years old ford taurus ! can you imagine ? only 2 years old car! and fuel cap went bad. He got a new cap and problem had gone. Everything get old with a time and after a while tend to brake (also gas caps!), so perhaps is good idea to buy new one , should not be expensive. Next, you have to investigate all fuel lines an its connections for any small leak as well as EVAP itself.I am tellin you , it can be a very difficult thing to localize, but everything is possible.Good luck! Z.
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