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Any advises on how to reduce fuel-smells ? I have ckecked all fuel lines and there are no leaks. Any ideas ?

where do you smell it: under the hood, interior? Always, or only when starting the car? Heating on/off ? Weather circumstances? Are you sure it's fuel you're smelling, not exhaust gas? Does the car run properly?

Smell inside the car and generally pretty much all the time. It is not exhaust gas and the car runs very well. It has been irrespectively of whether the heating has been on or off.

Try to controle on top of the tank or the fuelline is
still correct.Or the line on the right side from the motor.

You could also check for fuel underneath the carburator. Sometimes fuel comes out of the caburator via the overflowing. It will drop the fuel on the engine. (this is normal in case of a floated engine)
If this is happening all the time, your fuel level in the floater chamber might be too high. To solve this, you can adjust the floater level.