E39 Large EVAP leak - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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#1 (permalink) Old 01-16-2010, 08:53 AM
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E39 Large EVAP leak

Ive got a large evap leak on my 1997 E39 535i... Any idea where the best place is to start looking for this ?
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#2 (permalink) Old 01-16-2010, 10:20 AM
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Is it a little leak or major, is the CE light on? there are two possibilities either the fuel cap or the charcoal canister, please be aware I'm only going from passed experience, do you have any diagnostic codes?

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#3 (permalink) Old 01-16-2010, 10:51 AM
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Quote:
Originally Posted by marti5 View Post
Is it a little leak or major, is the CE light on? there are two possibilities either the fuel cap or the charcoal canister, please be aware I'm only going from passed experience, do you have any diagnostic codes?
Cheers for the reply Marti.

Well according to Autoenginuity it came up as - FE , EVAP Large Leak Detected
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#4 (permalink) Old 01-16-2010, 11:04 AM
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Okay...Its not the cap then, I would go for the charcoal canister, so do you have a light on?

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#5 (permalink) Old 01-16-2010, 11:20 AM
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No light on.. That's something else I need to look at as when I turn ignition on I would of thought it would of done a self check like it does with ASC and airbag light but no check engine light
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#6 (permalink) Old 01-16-2010, 11:26 AM
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If there's no light on and the cars running A1 I wouldnt worry about it until the car starts playing up...you can change the canister if you wish.

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#7 (permalink) Old 01-16-2010, 11:45 AM
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Well the car runs fine up to 60mph over that and it runs like a pig.. Hence the reason I plugged it into my laptop and got the fault
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#8 (permalink) Old 01-18-2010, 07:17 AM
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Found out why my CE light doesnt come on, Got a Dead LED
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#9 (permalink) Old 01-23-2010, 10:11 PM
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As stated above the charcoal cannister is a good place to start--there is a vacuum pump thats attached to it--when it's called upon it runs a test by putting vacuum into the system--when the vacuum does not hold--then it throws a code. Now the vacuum pump is attached with a rubber gromet that can fail where it all seals up--you could have a leak there--thats a common spot to check. Go to real.com and enter the last 7 digits of your vin number and then check around for what I am referring to for your model--there will be diagrams of the parts and how they go together --along with part numbers --just in case you find what your looking for.
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#10 (permalink) Old 01-29-2010, 01:21 PM
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Purchased a Charcoal canister and will be fitting it this weekend... Will post if this cures my problem.
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#11 (permalink) Old 01-29-2010, 03:27 PM
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Wishing you good luck!

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#12 (permalink) Old 01-29-2010, 03:39 PM
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Thanks mate
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#13 (permalink) Old 01-31-2010, 12:47 PM
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Changed the canister and i still have the problem
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#14 (permalink) Old 01-31-2010, 03:17 PM
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Sorry to see, best of luck sorting it!

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#15 (permalink) Old 01-31-2010, 05:18 PM
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Quote:
Originally Posted by Biggaz View Post
Changed the canister and i still have the problem

I had this same issue when I first purchased my car, it turned out to be the fuel vapor expansion tank.......one of the nipples cracked off, causing a large evap. leak! My was located under the fuel filler tube, behind the rear passenger wheel well cover.....#1 in link below:


RealOEM.com BMW E39 535i EXP.TANK/ACTIVATED CARBON CONTAINER

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