Pictured here is the application for a 2nd generation Cummins but I suspect it would work the same on any year or brand of truck.
In the first pic it shows the outside of the fuel tank and the mounting location that works best. By coming off the front of the tank nothing is sticking down below the frame rail. If needed you could even mount a small skid plate to the bottom of the frame rail to cover it all up. I also installed a shut off valve in case I need to do any fuel line or pump work without making a mess.
This pic was taken back when I had a dual lift pump system installed just in front of the fuel tank on the frame rails so it really makes it look crowded under there but never fear, yours will look much cleaner without all the extra space restrictions.
Now for inside the tank. YOU HAVE TO install a hose that extends to the center of the inside of your tank. This makes the fuel pick up point the same as on stock and prevents your fuel lines from running dry if your goin up hill to long. You also need some kind of screen to filter out debris before it hit's your lift pump. In my case I used a $3 fertilizer screen from the local farm store with a pipe clamp. I like simple and cheap.
I used the stock pickup outlet at the top of the tank to run my overflow back into the tank and capped off the old return inlet.
By using this method gravity is not fighting your Lift Pump. It's straight shot from the fuel pick up point right to the pumps. Gravity is working in your favor instead of against you having to suck fuel up a small tube constantly.
I'll welcome any questions on this. It's been in use on my truck for well over 150,000 miles now and one of the few things that I've had zero problems with.