This ought to be a snap!
Get yourself about 10 feet of clear tubing which is large enough to fit over the end of the fuel lines coming out of the bottom of the tank. Put one end into the end of a 5 gal. container and the other over the end of the fuel line. (Hemostats on the fuel line before you remove the clamp and nary a drop is spilled!) The tank sits high enough in the car for gravity to take over from there, especially if you have the rear of the car on ramps.
