place a full tank wherever you want it, and a unit off in the direction you want it to look, then do this:
this dotarget otherunit; "deletevehicle _x" foreach (cargo this);deletevehicle otherunit; this setdammage 1
that goes in the tanks init, and i can't garuntee it, the tank may die before it can target, but you have to name the "otherunit" so it knows who to target
EDIT: also setting is fuel to 0 would be a good idea