fuel cell???

[dman1982]

so ive gotta replace the gas tank on my 84 k10 short bed, had a idea, having a 16 gallon tank on something that is my dd and not good on fuel freaking sucks!!!!!!! ive gotta fill up every 3 days or so, depending how much crap i gotta do, so is what my idea was was to get a new tank, then get a 10-20 gallon fuel cell and putting it under my tool box since its pretty much wasted space anyhow, then running a line through my bed down to my gas tank and gravity feeding gas to my tank. ive seen threads on putting bigger tanks on towards the rear of the frame, but i wanna put a hitch on it very soon....or i would put it in the rear. input?