Greetings all. Apologies if this is in the wrong area, but not finding it any where else. I've got a RAM 2500 6.4. Love the truck, but only have about 200 mile range when pulling. looking for a gravity fed system, but everything seems to be rated for diesel. I've tried to find the difference, but no luck so far. Apparently its a DOT thing. Anybody got any answers?? Thanks in advance .