I cannot fuel my C230 coupe . The gas nozzle keeps clicking OFF andd I barely get 15 or 20 litres in a 'fill up', and it takes forever!! I just bought it used (66Kkm)and it's done this since I got it.
There is a breather hose attached to the filler neck, make sure this isn't kinked or clogged. Air needs to pass through this to fill properly. But in order to check it, you might have to drop the fuel tank. In the meantime you can try to slightly pull out the fuel pump nozzle just a bit to flow a little better
There is a charcoal cannister that captures fuel vapors. It has to vent displaced air when you're filling the tank. There are two possible problems; either the cannister is saturated with fuel from overfilling the tank or the shut- off valve is not openning
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