| Petrol Everywhere!!!
I am confused. I took my tank off last week as I was replacing my coolant tank. Found I needed to replace the mounting pins for the atmospheric pressure sensor so left the tank off. When I cleared up I put it safely upside down in the shed, no naked flames or sparks in there. Went in there tonight and petrol is everywhere and has soaked the underlay I placed the tank on. I don't understand how the petrol got out because it has defied gravity and came out of one of the outlets or something. Any one know why this has happened? The only idea I have is evaporation and condensing but I find that hard to believe. | 
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