Smell of petrol and lumpy idle

Hi all,



Lately I've been noticing a smell of petrol inside the car and when I open the boot it's stronger to the left near the petrol filter but not sure if that's normal.



The car has been running a little lumpy lately unsure if there is a connection but idling, the car hesitates then pops a little out the exhaust. I also notice the dasghlights dim when the engine hesitates.



Any ideas where I should start to try and rectify this?

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