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Hi all,

My S3 is running perfectly in this lovely hot weather and is a pleasure to drive. It runs on twin Webbers and does not miss a beat, but the last two times I have pulled into a garage to fill up with fuel, when unscrewing the filler cap, it has blown it across the forecourt because of the pressure in the tank. As this pressure is so high, I am now thinking of those poor rubber fuel lines and bulging fuel tank.
Is there a pressure relief valve or vent somewhere?
I have had many GTV cars in the 70s and Alfetters in the 80s but can't remember this ever happening.

Advice please
 

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My S4 does this. Maybe not quite as much pressure as you describe...
 

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a hiss is fine.....blowing off across the forecourt ain't:)
there is a vapour expansion tank/canister in the boot....there are 2 valves on the tubes back there, check both, marked 2 (air inlet valve) & 3 (check valve) on this photo.

Also remove the thin pipe that goes into this vapour expansion canister (top connection)...check for blockage.
 
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