I always have a very weak smell of petrol in my garage. I think it is just the tank venting as there has never been the slightest sign of any leak.
Be careful with blocking any vent for the tank completely - it is possible for them to literally "blow up" like a balloon. You only have to leave the car in the sun (what's that) for a few hours on a sunny day to warm up sufficiently to cause a problem. Remember also that the high pressure fuel pump uses the petrol as a coolant. The fuel returned to the tank is significantly warmer adding to the problem.
I used the one way valve to allow air into the tank. But I also made a small nick in the rubber washer inside the valve which allows the build up of any pressure to be slowly released. I did this after filling up one day when there was a huge rush of escaping air when I took the filler cap off.
Robin
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