Join Date: Apr 2006
Location: Metro Detroit, Michigan
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You shouldn't have to "crack the fuel tank cap".
As previously pointed out, you will need some form of air leak to prevent a vacuum. Every cap I've used had a thumb screw in the center of the cap that when loosened, allows air in the tank. Cracking the fuel cap would work, but it could get messy if the tank is near full.
Those grand fresh-water seas of ours - Erie, and Ontario, and Huron, and Superior, and Michigan, - possess an ocean-like expansiveness...They contain round archipelagoes of romantic isles...they have heard the fleet thunderings of naval victories...they know what shipwrecks are, for out of sight of land, however inland, they have drowned full many a midnight ship with all its shrieking crew. --from Moby Dick