Pull the tank & pull out the pump/fuel level assembly. I used one of those rubber straps to unscrew the top where the assembly is. Mark the lid and tank body, to make sure you re-tighten it about the same, before you take the "lid" off. Look over the fuel pump/level assembly and take out the pump portion and replace that section with a hose that can take submersion in diesel fuel. Also before you pull the tank mark the return hose and the IP feed hose where they enter the tank. Mix these 2 hoses up and you'll run out of fuel with the fuel guage showing 1/2 tank full. I did this myself, and besides driving me crazy, I had to pull the tank again, this time 1/2 full of fuel. Also the vent pipe goes to the engine compartment, on that end I places a cheapo gas filter to serve as an air filter for the breather. I also pulled out the vent valve internal components (springs & stops) in the top of the fuel tank to help in filling the tank. When filling, after the initial pop off of the gas pump, I'm able to get in 2 to 3 more gallons if I milk-it in. For me that equates to an extra 45 to 60 miles of extended travel range (I have a Zf auto box).