On my '56 3100 I used a 55-59 Suburban/Panel gas tank that mounts between the frame rail and drive shaft on the bassenger side. Then I ran the filler pipe to the rear fender behind the wheel. I used a filler assembly unit made by Tanks, Inc. I ran the tank vent to the top of the fender well using one of the fender mounting bolts with a ell bracket to hold the rollover valve/vent in place. The only issue I have is I have to fill it slow, as fast fill will make it burp back, but I can live with that.
I didnt want my tank under the rear of the bed for three reasons... 1) I wanted to keep my spare tire in place 2) I wanted to be able to fill the truck if I had a load in the bed and 3) I didn't want my truck to go up in flames if there was a rear end wreck.
Mike B
