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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum Tank vent leak and Missfire
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      03-18-2023, 10:53 AM   #1
Jack Bell
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Tank vent leak and Missfire

Ive been having a problem with my high rpm’s causing a rough acceleration and misfires for a few weeks. looked for problems like spark plugs and clogged injectors but i can’t quite figure it out. i finally got a code that showed “tank ventilation leak and purge air system” in my bimmerlink but i’m not sure which parts it’s referring to to fix it. i’ll attach screen shots and if anyone can help me diagnose what’s wrong and what i need i would appreciate it!
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      04-13-2023, 12:41 AM   #2
e4603
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You may get a free repair - BMW extended the warranty of the fuel tank leak diagnostics module (NVLD) to 10 years 120k miles.

https://static.nhtsa.gov/odi/tsbs/20...46992-9999.pdf

Last edited by e4603; 04-13-2023 at 12:46 AM.. Reason: Added link
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      04-14-2023, 11:48 PM   #3
sszablya
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The leak test can be carried out with a leak detector.
Possible causes may be:
- Tank cap leaking (check tank cap pressure relief valve)
- Tank ventilation lines leaky (fuel tank-activated carbon canister-tank ventilation valve)
- Tank ventilation valve leaky (engine compartment)
- Fuel level sensor flange on tank leaking
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