1998 Holden Vectra • 140,000 miles

Hi I have a suspected fuel leak at the top of my fuel tank. When I parked nose first up a hill with a full tank the next morning I had 1/4 of a tank and a rainbow of fuel out the back of my car. What can I look for to find out where it is comming from and how much will it roughy cost to get it fixed? I also have an acceleration problem when I put my foot to the pedal (not flooring it either) it revs extreamly high in first gear but I do get my regular acceleration why could this be? Thanks
December 15, 2012.

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