Fuel will evaporate over time and usually only last a couple of days. Try using a fan to pull air out of the bilge during the day and leave a hatch on the opposite side of the boat open.
If the smell does not go away you have a leak somewhere which is not uncommon or a new build or refurb. This is especially the case when you redo the tank and all the hoses. The last time mine was changed with everything I was very meticulous in double clamping and tightening everything with the best of hardware. After a few weeks I had a smell that wouldn't go away and cut the top off the deck again. I had found that every vent, fill and supply hose end needed tightening and not just a little. Once I let it sit in the sun I re-tightened everything again and have been leak free for years. Hopefully this is not the case with yours but if so, its not the end of the world if you can get to all your fittings without cutting glass.
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[b]The Moose is Loose !
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