mxracer3651,
The others advice about tank pressure is spot on. One other precaution that I would like to throw out. Make sure you replace the standard stopper in the fuel tank with one designed for gasoline. Also, you can't use standard silicon fuel tubing with gasoline, you'll need to use Tygon tubing instead. Gasoline will dissolve the silicon fuel tubing and the standard tank stopper that comes with the fuel tanks.

[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXD755&P=7]Dubro Gas Conversion Stopper[/link]
[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXD739&P=ML]Dubro Tygon Tubing[/link]

Ken