Petrol Cap on a V7 Classic

Hi,

I noticed something odd after I last filled up.

Some miles and a few days later, I started smelling a strong petrol odour when approaching my bike, but there was no obvious signs of any leak onto the ground. Then I noticed a strange residue around the petrol cap, which also turned out to smell strongly of petrol. Took the cap off and there was a whoosh of vacuum being released. At no point did the engine stop running.

This happened again a couple more times having ridden some miles. Engine running fine but a vacuum building up in the tank and strong smell of petrol when near the bike.

So I then put the cap back on turned through 180 degrees when fitting it - and the problem seems to be solved!

The cap does seem to have a right and wrong way round…?!

Jim