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Same problem we always have with 1st gen tundras: Finding someone who makes aftermarket parts to upgrade with.... this time I'm trying to find someone who makes an larger/expeditionary fuel tank to replace my factory fuel cell. I've seen some for 2nd and 3rd gen tundras (Transferflow), but yet again, nothing for 1st gen's. Any suggestions from the crowd??? I've read a lot of discussions about home-shop projects fitting cannibalized tanks that are small enough to fit under the bed where the factory spare tire would normally go and using that as an auxiliary tank, but obviously that involves creating a whole other fuel port and most of those aux tanks feed/pump directly into the main fuel cell, not directly to the engine, plus I'd rather just have one larger cell. I have an incredible amount of spare room under the bed behind the axle since my spare tire and exhaust tips are no longer located back there, so IDEALLY I would much rather just swap out my factory tank for one that expands towards the center and rear of the vehicle (I could easily fit another 50 gallons under there before I'd had to start worrying about weight/balance). If anybody has cannibalized something like this that fits under our trucks, that would be awesome to hear about...
2003 Toyota Tundra SR5, iForce V8
Blue Lake Off Road custom front bumper, custom injectors, custom exhaust from Dirty Deeds Industries, Spec-D Tuning cold air snorkel intake, Optima Yellow Top, Smitty Bilt cable winch, A.R.E. camper shell, homemade steel rear bumper, Rigid Industries 20" spot/flood combo light bar
 

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I have an auxiliary tank that I had installed on my 1983 Toyota PU that sat directly above the spare tire and it actually had a hole in the center of it so the chain could still be used to lift the spare into place. When I got rid of my 1983 I pulled it thinking I could use it on a future project. The only problem is the tank has an additional filler tube and gravity fed into the bottom tank. Not sure how this would work with the newer electronic fuel pump vehicles. If you had any welding skills (which I don't) you could probably fab one up to fit directly where the original tank is just larger. That is what I would want to do.
 
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