I had a similar issue on my 2lt petrol. Since I had it I could smell petrol when stationary.
Wasn't able to find the source of it for months, until one day I was refitting the skirts and noticed one of the plastic pipe clips underneath the drivers footwell looked oily, petrol residue!
Trace the pipe to the section where is raises up from underneath the floor into the engine bay. A 5" length of pipe quitre badly corroded underneath the plastic sheath.
Not an easy place to work on, so I removed the whole pipe out through the engine bay (uncoupled from the fuel tank end), cut out the corroded section and replaced with a 6" length of fuel injection hose clamped at each end with two small jubilee clips just to be safe. No leaks and no smell of petrol since.
I still think its odd that only that section corroded, it wasn't contacting anything and the rest of the pipe was mint.
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