Code: Inspect Fuel Supply System

[MNJarhead]

I have a 2000 316i with European specs and an M44 engine I'm in Germany. Shortly after I bought the car the check engine light came on. I bought the Peake tool to read the code and the code it was throwing was "Pruefung Kraftstoff-Versorgungssystem". If I'm translating that right it's "Inspect Fuel Supply System". I replaced the fuel filter and fuel cap and added some material to make the gasket seal and looked for any other possible problems. I can't find anything wrong and the car is running fine. I've reset the light a couple times and every time it comes back on in a couple days.
Is there something I have to do to let the computer know that I inspected the fuel system? Or is there something else wrong that I'm not seeing?

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: Reading BMW Fuel Injection Fault Codes

[Wayne 962]

I'm not super familiar with this code, but it does sound like you're on the right track. There may be a vacuum leak somewhere in your closed fuel system. On these modern cars, there is a pressure sensor that detects the pressure in the gas tank. If the pressure sensor indicates a leak to atmosphere, then it may trigger a code like you've found. I would check all of the fuel breather hoses, the gas cap (as you have done) and the general condition of the fuel system. If you drive for a while and then remove the gas cap, it should make a "swishing" noise as air rushes in. If it doesn't then it may be a symptom of a vacuum leak in the tank / fuel line system.

- Wayne