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Spare fuel tank option-why won't this work?

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I found this aluminum fuel tank on Amazon. Paid $127. It holds 12 gallons, which is way more capacity than a person needs, I know. But it tucks under the rack nicely. I can fill it easily, it's securely mounted, and adding gas to my tank or even someone else should be simple. Let gravity do the work. What are your thoughts?

2024 Tacoma Spare fuel tank option-why won't this work? 20250202_131444


2024 Tacoma Spare fuel tank option-why won't this work? 20250202_131431
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StreeTaco

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Very cool. I like it.
Only thoughts.. I’d be looking for an under-truck area to mount, then proceed to install an electric fuel pump connected to an Aux switch. But that’s just me. Good buy!
 

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Just don't fill the stock tank above the full level. There's a closed vent system or some such technology in the fill spout.
 
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Yes it's rated for gasoline. People who reviewed it used these (smaller ones) to replace plastic tanks on riding lawnmowers, tractors, etc. Some even put them on hot rods and other custom cars. The finish is a little rough for show in my opinion.
 

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Good point on over filling, I would only transfer from spare to main tank if the main were nearly empty. This is more emergency use only, think Jerry can.
 

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It holds 12 gallons, which is way more capacity than a person needs, I know.
Speak for yourself. My 4R has a 15 gallon auxiliary gas tank in addition to the primary. Plus, 5 gallons on the back bumper. That is ~35 gallons onboard. I guess my degree of exploration is different than yours.

If somebody ever makes an aux tank for our truck I will own it. No hesitation. No questions asked.
 
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Evidently you are quite the explorer! I figured >500 miles of range would cover me between gas stations. (18 gallons stock + 12 gallons aux =30 gallons. 30 gallons x 18mpg= 540 miles)
 

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Evidently you are quite the explorer! I figured >500 miles of range would cover me between gas stations. (18 gallons stock + 12 gallons aux =30 gallons. 30 gallons x 18mpg= 540 miles)
Correct, I do like to adventure. It's not just the distance between fuel. It's also the ability to pass by expensive fuel. I did have an adventure a few years ago down in Baja. I was fine, barely. But, my buddy was running on fumes, and the Pemex station we were going to fuel up at was out of fuel. He ended up getting gas from an expat's boat.
 
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Wow! Cool story. I agree an aftermarket auxiliary tank would be nice. This will have to do until then.
 

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Very cool. I like it.
Only thoughts.. I’d be looking for an under-truck area to mount, then proceed to install an electric fuel pump connected to an Aux switch. But that’s just me. Good buy!
Pretty difficult to fill if it under the bed?
 

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Pretty difficult to fill if it under the bed?
My 4R has a fill neck in the wheel well. It's only an issue if I've been in the mud. The other solution is to have a double fill neck. Pop the fuel door. Left hole is the factory tank. Right hole is the aux tank. Or, you can do it the Land Cruiser way. Have a slider in the fill that you move to divert fuel to one tank or the other.
 

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Not to be a downer, but do you really want to be sleeping near a large volume of raw fuel? Just an observation. On a related note, I wouldn't be surprised if someone actually develops an auxiliary tank which properly mounts within the frame.

As a FYI, I've used and would recommend rotopax, however they have a couple of drawbacks in my opinion based on my experiences with them.

1) Costly, overpriced in my opinion.
2) Neck deforms, well mine did - kept it full on my SxS, and at one point when I actually used it, the spout leaked because the neck deformed, seems to permanent, although I suspect could be fixed with one of those costly metal spout assemblies I'm thinking.
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