I had a tank similar to what you describe for over 14yrs. Was the best thing I ever had in the pickups! Being able to get fuel when and where I wanted to, as well as better prices.
I had mine setup the same, a 12V pump mounted by the tank feeding into the main tank filler neck.
I added a 12V solenoid shut off valve so when the pump wasn't powered it shut off. Stops the siphoning through the pump. If you don't have that it will fill till the inlet hose is filled up and the filler neck is full. I didn't like that. Some folks don't even use a pump at all and gravity feed it same as when the fuel siphons back through a pump. Each their own.
Be sure to get a pump designed for Diesel there is a differnce between those and gas. It will not last.
If you are somewhat handy, check out TSC stores, they have the tanks there and any auto parts store has the rest. The install is pretty easy.
On the filler neck I cut the big hose and spliced in a piece of abs plastic pipe that fit perfectly and added a 90 degree fitting that secured into the pipe and the fill hose from the pump attached.
Bill
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