RPM fluctuations, Fuel tank vent valve

flynscot · 11-20-2016, 02:29 PM

So I have the same problem as other members have described regarding engine RPM fluctuations after filling the tank. Most opinions point to the fuel tank vent valve as the culprit.
My question is, where is it located for a DIY?
Anyone done a DIY for this?
Thanks

Rat3d ///M · 11-20-2016, 02:43 PM

http://www.m3post.com/forums/showthread.php?t=1273927

You're welcome

nycplumber · 11-20-2016, 05:12 PM

You are shutting your car off during fill up right?

drrust · 11-20-2016, 06:14 PM

Quote:

Originally Posted by nycplumber

You are shutting your car off during fill up right?

The fuel tank breather valve is a well documented problem. Irrelevant comments are just that. If you have direct experience please comment, does idle fluctuate if you fill up with the motor on?

Rat3d///M's DIY is one of the best in the DIY section. The details mentioned in removing the plenum are second to none. I experienced the symptoms mentioned, sometimes it only happened once after filling up other times it would stall multiple times. Some fill ups would not have an issue. Followed the DIY, issues I had and relevant comments are posted there.

flynscot · 11-20-2016, 06:21 PM

Quote:

Originally Posted by Rat3d ///M

http://www.m3post.com/forums/showthread.php?t=1273927

You're welcome

Thank you, don't know why this did not show up during the many searches I made.

flynscot · 11-20-2016, 06:23 PM

Quote:

Originally Posted by nycplumber

You are shutting your car off during fill up right?

yes, car is shut off every time as it is the rules on the military base where I fill up. Also, does not happen every time. Seems to be more prevalent when I only drive a short distance after the fill up.

Phil5129 · 11-20-2016, 06:51 PM

Had this issue as well. Mine was after almost every fill up. Followed the diy in June, fixed the problem. It's really easy to do.

DSilk · 11-21-2016, 07:31 AM

You have to learn to trust the pump shut-off system, and not try to squeeze another 50 cents or so into the tank after it shuts off. I have never had this issue.

drrust · 11-21-2016, 08:41 AM

Quote:

Originally Posted by DSilk

You have to learn to trust the pump shut-off system, and not try to squeeze another 50 cents or so into the tank after it shuts off. I have never had this issue.

Happens without adding more when the pump shuts off.

USCTROJANSFIGHTON · 11-21-2016, 10:58 PM

fuel tank breather valve

fuel tank breather valve

Had same issue.completed under warranty. Havent had it since. Dealer had a hard time replicated it...I told to keep trying. After the 3rd fill up it.. happen. Crazy RPM..then stall.

11-20-2016, 02:29 PM	#1
flynscot Private First Class 102 Rep 103 Posts Drives: E46/E90/F80 (sold) F82 now Join Date: Nov 2009 Location: Maryland iTrader: (0)	RPM fluctuations, Fuel tank vent valve So I have the same problem as other members have described regarding engine RPM fluctuations after filling the tank. Most opinions point to the fuel tank vent valve as the culprit. My question is, where is it located for a DIY? Anyone done a DIY for this? Thanks
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11-20-2016, 02:43 PM	#2
Rat3d ///M 997.1TT 1003 Rep 1,672 Posts Drives: 2007 Porsche 911 Turbo Join Date: Oct 2014 Location: Germany iTrader: (1)	http://www.m3post.com/forums/showthread.php?t=1273927 You're welcome
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11-20-2016, 05:12 PM	#3
nycplumber Major 686 Rep 1,230 Posts Drives: slow Join Date: Apr 2016 Location: nyc iTrader: (0)	You are shutting your car off during fill up right?
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11-20-2016, 06:51 PM	#7
Phil5129 Second Lieutenant 74 Rep 269 Posts Drives: BMW E92 M3 Join Date: Jul 2016 Location: Rochester Hills, MI iTrader: (2)	Had this issue as well. Mine was after almost every fill up. Followed the diy in June, fixed the problem. It's really easy to do.
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11-21-2016, 07:31 AM	#8
DSilk Major 550 Rep 1,148 Posts Drives: 2008 BMW M3 Coupe Join Date: Jun 2015 Location: South Florida iTrader: (0) Garage List 2015 Jaguar XJ [0.00] 2015 Jaguar XF [0.00] 2014 VW GTI [0.00] 2008 BMW M3 Coupe [0.00] 2007 VW Passat 2.0T [0.00]	You have to learn to trust the pump shut-off system, and not try to squeeze another 50 cents or so into the tank after it shuts off. I have never had this issue.
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11-21-2016, 10:58 PM	#10
USCTROJANSFIGHTON Second Lieutenant 24 Rep 217 Posts Drives: Car. Vrooom. Join Date: Sep 2012 Location: San Diego,VEGAS,IRVINE,LA,MOON iTrader: (1)	fuel tank breather valve fuel tank breather valve fuel tank breather valve Had same issue.completed under warranty. Havent had it since. Dealer had a hard time replicated it...I told to keep trying. After the 3rd fill up it.. happen. Crazy RPM..then stall.
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