I am wondering if it is possible to siphon gas out of the rear tank on a '96 F150. I asking because we are going out 4x4ing this weekend and instead of bringing some extra gas cans, my buddy said he would simply fill up both his tanks and we could use his rear one to fill my jeep becuase he doesn't use his truck on the trails. I know some vehicles have one way valves in the tanks or in the necks, but don't know if Fords do.

Thanks