the fuel spill on the fuel tank cap axillary?

I filled the main fuel tank and was driving on the motorway when I saw that I was wasting petrol on the fuel tank axillary CAP. When I fill the main tank axillary tank was already full of gasoline. Any suggestions on where I should be looking to rectify the problem? The RV is a 1978 Midas RV on a Chevrolet chassis with an engine 454.

switch and run TO the tank engine for about ten miles

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