hi, i just got a 79 4x4 stepside with dual tanks. there is no switch to go from from the left side to the right. the left side as far as i can tell is not hooked up an im only getting fuel from the right tank. when i first got the truck i stopped at a gas station and put fuel in the left tank and it leaked out about a gallon of gas before it stopped, and the gas gauge didnt move. so i filled up the right tank and everything worked fine on it. my question is without a switch to go from one side to the other, how do i use both tanks? i have one tank completly full of $2.50/gal gas and cant use it! any help?