Would love to see if someone comes up with aftermarket exhaust. It seems huge vs. overseas diesels. I'm not sure if its the muffler or muffler + catalytic converter, but man that thing is huge. The 300 series has plenty of room for driveshaft, muffler and TWO fuel tanks between the rails. Check out this photo of a 90 L replacement sub (aux) tank for the 300 next to the factory 30L sub tank. With replacement tanks they can push 270 L of fuel capacity. 71 GALLONS!
GX550 fuel tank in a Land Cruiser
- Thread starter MtBiker19
- Start date
- Moderator
- #22
So ..... Toyota didn't invent a new "type" tank or fuel pump for the LC, of course the tank is a different shape than others because it's a new frame/body and the available space is different than other models.
A fuel injected engine is a fuel injected engine, whether port injected, direct injected or both, nothing special about that. When the ECU calls for fuel, it turns on the fuel pump and turns it off when it doesn't. How often this happens has nothing to do with fuel tank or fuel pump but how often residue fuel is returned to the tank (diesel is a different story).
If you read the warning in the manual about being "pressurized" , you are correct about the EVAP system, just like every other fuel injected vehicle. Most probably put in there along with many other warnings so that Toyota wouldn't be liable for the idiots out there waiting to sue because they inhaled gas vapor.
The fuel pump for the LC has the same part number as the fuel pump for the GX.
So the limitations as I see them are; the physical space available in the LC vs the GX and the physical location of the fuel pump, relative to the frame, on the LC vs the GX and is why the GX fuel lines were ordered (hopefully won't be needed).
- Moderator
- #23
Can't see where I'll ever need 71 gals between fill ups.....LOL but I might look at that 10 aux tank someone posted about.
Your logic appears sound to me!
I think the American parlance is auxiliary tank but the rest of the world calls it a “sub tank” . I looked around to try and find out what the part number is and what Toyota actually calls it but I’ve had no luck yet. Very curious to see where it actually gets installed. On the LC 300 it sits just on the other side of the drive shaft close to the exhaust. I believe there has been some confusion as the prior generation Land Cruiser Prado did have multiple fuel tank options one of which required a tailgate mounted spare tire to free up room for a massive tank where the spare tire normally is. However, that was just one configuration. I think they called extended range package. However, most of them still had both a main and sub tank even with the tire mounted in normal place between the rails. Moving onto the new current generation Prado that is called the Land Cruiser here it also has the main tank in the sub tank and people overseas are complaining that there’s not a provision to spare on the tailgate. So there should be room for a sub tank under there even with the spare tire place. One giant caveat all of the above those are all diesels and ours is gas. I’m not sure how easily a diesel tank and associated plumbing can be converted to use gasoline.
The 2025 Land Cruiser is built on the TNGA-F global truck platform that is shared with Tundra, Sequoia. That being the case, I hope that a larger tank from the 2025 Tundra or Sequoia might fit our 2024 Land Cruisers.
Exactly! Don’t forget that TNGA-F is a global platform with multiple other configurations that are not sold here, including provision for a sub sub tank on diesels.
It’s also same platform shared with the Land Cruiser 300 diesel which also has much larger main and sub tanks. I’m not positive, but it looks like the main tank on Land Cruiser 300 gas versions is the same size as the GX 550. That might be the same tank.
I didn’t realize that the TNGA-F platform was shared with the LC300…
- Moderator
- #29
The TNGA-F platform is configured slightly different for different bodies. It's my understanding that the parts are the same, however the engine crossmember, transmission crossmember, Xfer case mounts, spring mounts and other major parts are repositioned for each body/engine/Xmsn combination. The frame sections also can be stretched further apart or slid closer together before they are permanently welded together.
So most LC and GX 550 parts/options should be a direct exchange. Where parts between other models may or may not fit, as an example (just an example) the Sequoia has a longer wheel base so the rear suspension, rearend might be a direct swap but since the TNGA-F platform was welded in a longer version and made more room for the fuel tank, that tank wouldn't fit on the LC due to the shorter frame. But the fuel pump sending unit etc....... would be the same across all models.
So most LC and GX 550 parts/options should be a direct exchange. Where parts between other models may or may not fit, as an example (just an example) the Sequoia has a longer wheel base so the rear suspension, rearend might be a direct swap but since the TNGA-F platform was welded in a longer version and made more room for the fuel tank, that tank wouldn't fit on the LC due to the shorter frame. But the fuel pump sending unit etc....... would be the same across all models.
Thanks. That makes perfect sense.
- Moderator
- #32
Not yet, as soon as it comes in, I plan on installing it and post on the process.Any news on the tank since last post? I'm very interested.
Are there any concerns about fuel gauge accuracy, DTE and mpg calculations with changing tank size?
- Moderator
- #34
Not from me....... The tanks appear to be the same depth but longer. So proportionally 1/4 tank will still be a 1/4 tank just the 1/4 will be 5.7 gals vs 4.3 gals. I assume the DTE is based off of fuel consumption and may or may not be self learning and be off a bit, but a couple of fill ups and I'll know I have "x" gals of fuel when the gage reads empty and the DTE says "zero"..... I can live with that.
Very excited to see how this turns out!
Makes perfect sense. Are there pictures of the tank(s)?
- Moderator
- #37
Not that I know of, just snipits from vehicles on lifts, they both have the same fuel pump/sending unit
Awesome! Good luck on install.
Looks generally doable but probably need more than just the tank and maybe fuel lines. Also side guardss and different hanger by the looks of it. Otherwise pretty similar. Fingers crossed.
