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Gas cap/ check engine light

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Old Nov 10, 2024 | 09:04 PM
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e350
Gas cap/ check engine light

For past month everytime I get gas, about 12 hours later the check engine light will come on, I hooked up scan tool and it says loose gas cap, it's been happening for past month or 2, then it will go off few days later, anyone else experience that? Also should I buy new gas cap?
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Old Nov 10, 2024 | 09:30 PM
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W212 MY'14 M276-3.5NA @75kMi
NOT COMMON EVAP FAULT

Originally Posted by donny79
For past month everytime I get gas, about 12 hours later the check engine light will come on, I hooked up scan tool and it says loose gas cap, it's been happening for past month or 2, then it will go off few days later, anyone else experience that? Also should I buy new gas cap?
Lucky you stopped by... now you're going to save some money by using our scanner.

Read the scanner data stream about your EVAP purge. There are automatic scanner tests to run against this system.

Before you spend time to figure this all out... you can do a visual inspection of the gas cap and the line...
Any way someone may have tempered with your gas filler pipes??

Last edited by CaliBenzDriver; Nov 10, 2024 at 09:32 PM.
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Old Nov 11, 2024 | 05:55 PM
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Been happening to me as well the past few months. Usually i just screw it back tighter but now thinking i should replace it.
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Old Nov 11, 2024 | 07:19 PM
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Either replace it or the seal, which should be available. A few bucks to try.
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Old Nov 11, 2024 | 07:33 PM
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EVAP SENSOR

I wonder if this has to do with the intake vacuum level that's pulling on the EVAP canister sensor.
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