Use cellulose thinners and talcum powder to remove as much of the fuel that has soaked in. Brush the thinners on then the talc then wipe off. Repeat until it wipes clean.

Mix up some epoxy and smear it on to the wood. Let it go off abd reapply the covering.

You will need some new covering probably, I I have never had much luck with fuel soaked covering but you can try.