When is a Gas Cap issue not a gas cap issue?

[MrAdventure]

In the last few weeks, I've been getting more than a few Small Evap Leak codes (P0442), and the 'Check Gas Cap' light has come on more than a few times. The gas cap's looked pretty ratty, so I replaced the cap yesterday. I'm still getting the gas cap light and the leak code. I've reseated the new cap, but it doesn't seem to make a difference.

Today, I noticed that the new cap already has a gas smell, and looks damp around the seal, as does the filler area. I last filled the tank several days ago and I'm now at 3/4 full. Is that indicative of a bigger problem?

What should I be looking at, here?

[slater]

could be a bad evap purge valve or a vacuum leak in those lines. not sure what else would trigger a P0442.

[BMWCurves]

Shawn had an issue with a corroded hose near the charcoal container. Not sure if that was throwing any codes at the time for him.

[ELCID86]

Yep. Also had p0456. And here was the culprit. Pull the wheel well trim by the gas filler tube. Ifirst replaced the two evap pumps (engine and charcoal can) to no avail.

https://uploads.tapatalk-cdn.com/20170524/37f41d3b3e297ce2e32dbaafeb689b8f.jpg

https://uploads.tapatalk-cdn.com/20170524/e98686a2d3f22bf0298c8ced6d8c2962.jpg

https://uploads.tapatalk-cdn.com/20170524/366e12cec7a2868c30bdc156549a1d64.jpg

https://uploads.tapatalk-cdn.com/20170524/505b19c5fc6aafbf5f4ebac832dc9904.jpg

[slater]

oh right! that little F bomb... :) forgot about that one.

[Oli77]

Car got a P0442. Will replace the gas cap first and then investigate in this area. thanks for the pics Shawn.

[ZHPizza]

Car got a P0442. Will replace the gas cap first and then investigate in this area. thanks for the pics Shawn.I don't have a code, but went ahead and bought this as a preventative since my cap gasket is pretty well cracked

RKX Replacement Gas Cap Fuel Seal... https://www.amazon.com/dp/B07BNX8MT9?ref=ppx_pop_mob_ap_share

[Oli77]

Duuh, could have bought just the seal!

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[Oli77]

New gas cap, cleared the code and on we go.

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[johnrando]

Good

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[Oli77]

Getting code again. The gas cap purchased 4 months ago was not OEM. It is not sealing correctly apparently. So bought an oem replacement part...

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[GeorgeH]

If anyone ever needs that metal vent hose connector, I throw these away all the time. Pay for postage and I'll send you one.