Originally Posted by mbopp
An aux tank needs to be tied into the fuel and emissions systems otherwise you'll get an emissions code on the Check Engine light.
You could rig a stand-alone tank and use a 12v fuel transfer pump to fill the truck tank, but you'd have to pull over to the side of the road to do it.
I work in the oil patch... Thats How EVERY RIG manager and DRILLER does it.
One guy decided to hard wire his pump in and lock the nozzle. Someone came by, cut the lock with bolt cutters, and filled his own truck.
Camera caught everything... But the license plate.