Try a power hose on your tyres, or at the very least, get some cheap washing up liquid, take your wheels off one by one and give then a good scrubbing with neat detergent getting into the tread, then rinse them off with water.
You may have trapped a bit of fuel in the treads and it could be seeping out.
If this doesn't cure the problem, you can atlast eliminate your tyres - and they'll be nice and shiny!
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