Mpg

[dorkweed]

It's moving the fuel tank vent to a "higher" location so that you can get more fuel in the tank. The reasoning behind this is that...............it's the same tank when the truck is built whether it's a gasser or diesel. With a gas truck you have to allow some expansion room for the expansion of the liquid fuel as well as the vapor. And since gasoline vaporizes way more readily than diesel fuel, you need a "buffer"/ extra tank space to accomodate the gasoline vapors. Diesel fuel doesn't vaporize as readily as gasoline does, so we can use the extra tank space for fuel. Crawl under your truck and look at the fuel tank. It's not just a square box, but it's a staggered layered compartment. By moving the vent to a higher location on the tank, you can fill the tank with more fuel!! There's a couple companies that make kits for this, or you can do a search here for the parts needed. I'm pretty sure it's in the archives!!! If not, Mike will know where to point you!!In my opinion, this is the best mod I've done to my 04.5!!!