Fuel smell in car

I have a fuel smell within my car which I have been unable to stop - all hoses have been renewed with unleaded compatible rubber, the tank has been pressure tested and there are no visible leaks - when I last checked the sender unit the 'O' ring had grown in length so I replaced it with another - maybe that 'O' ring is also incompatible with petrol so I will check its composition - the tank doesn't appear to be vented - any ideas? The car is a 1969 NSU Ro80


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