Daves57truck If you are trying to hinge the whole floor look at a linear actuator from Autoloc @ www.autoloc.com. I have seen smaller ones that operate a trunk lid as well in some of the Hot Rod mags. If you want a small door just over the gas cap use a latch cable from new model foreign car with a door popper to make it spring open. Good luck and may the fabrication gods be with you.

Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Things may come to those who wait...but only the things left by those who hustle."-Abraham Lincoln