Alright, here's some pictures.
In the first picture you can see both tanks, they are set up so that I can still mount a spare tire later on. The back one is shallow and is where the vent and filler fitting hook up. At the bottom there's a hose that bridge over to the front tank. Just beside the left shock you can see the filler hose running along the frame rail. EricN spent a lot of time helping me out on these as well as Isaac who kinda went through hell partly because of me (inside story... sorry Isaac!)

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The 2nd picture shows the connection between the 2 tanks.

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3rd picture is the front tank, you can kinda see the auxiliary fuel pump at the top front corner.

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Here's a better picture of the fuel pump.

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Now for the interesting stuff... Credit goes to Isaac for coming up with this idea.
This is the filler hose that is neatly tucked away where the bottle jack used to be. (Useless to me with my lift). The vacuum line makes a large loop and is always tucked in there.

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All I have to do is pull the filler hose through this botched opening (was planing on installing a filler cap but changed my mind and design). This is a hydraulic quick connect, similar to a air compressor system but can handle fuel and pressure. The male part is permanently mounted on my truck while the female part is attached to my filtration system.

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Now I simply connect them together and start my pump to quickly fill up my tanks without a mess. As you can see the vacuum line is now pulled down so that when the tanks are full it start to overflow into a cube. When all done I simply push it all back in place. I still leave the vacuum line sticking out about 6" so that if oil comes out it won't be in the truck but that's unlikely unless I'm really full and weather changes.

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