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I got one in my 05 f350 shortbox and it works well. I just extended my fuel cap with a pipe so I can still fill it from the top of the deck. I will try to get pics.
Please, please, please...run a vent hose out from under your deck off the tank! Don't turn your truck box into a bomb! Also, a ground wire out to where you can get at it if you have a plastic box liner. Always ground the tank to discharge any static while filling it.
I haul diesel, so not too worried about static ignition and becoming a bomb. Ever use diesel to start a fire? It take a bit to light unlike gasoline and its "woof" into flames. I would be more worried about the 3 or4 jerry cans of gas bouncing around under your decks.![]()
Even if your just running diesel, I would check with your insurance company to make sure your ok. And I know in Canada if you go over 100 gallon there becomes a ton of restrictions.
I agree, diesel is less of an issue. I know of a number of people carrying race fuel in a slip tank under their decks though. Totally agree about the jerry can issue, but at least they gotta take 'em out to fill 'em...hopefully on the ground rather than the tailgate!