29gal Main Fuel Tank Install

lol it’s my initials
Same. I assume you’re a DD whereas I’m a WW. Still funny. Ever watch ‘Step Brothers’? “Did we just become best friends?” I think you’ve gotta be Dale because of obvious “D” reasons.
 
Same. I assume you’re a DD whereas I’m a WW. Still funny. Ever watch ‘Step Brothers’? “Did we just become best friends?” I think you’ve gotta be Dale because of obvious “D” reasons.
Lmao maybe? Step Brothers 2: LC250
edition
 
Great write up and product details.
I love working with our guys in Chine, the rest is short term BS.
When you have more data and details posted i may have to do this, if the gauge worked correctly i would probably just order the tank kit and have it installed. Really temping i admit, need to think about the constant gauge minding part a bit more.
Great posting, great mod, thank you.

Fuel System Compatibility & Low-Fuel Indicator:​

This fuel tank is engineered for seamless integration with your vehicle's original fuel monitoring system. Upon installation, the factory fuel gauge and low-fuel warning light will function as intended
 
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Great write up and product details.
I love working with our guys in Chine, the rest is short term BS.
When you have more data and details posted i may have to do this, if the gauge worked correctly i would probably just order the tank kit and have it installed. Really temping i admit, need to think about the constant gauge minding part a bit more.
Great posting, great mod, thank you.

Fuel System Compatibility & Low-Fuel Indicator:​

This fuel tank is engineered for seamless integration with your vehicle's original fuel monitoring system. Upon installation, the factory fuel gauge and low-fuel warning light will function as intended
If that is from the product site, it’s obviously misleading re the fuel gauge working as intended. As I’m told directly from the manufacturer, the fuel light will come on with 4 gal in the tank, and while it all “functions” the same as it did, the miles to empty will be wrong and just decrease as you drive more slowly than with the oem tank. So not malfunctioning but not particularly useful either.
 
All, this is bound to be fairly long. I'll try to keep it as tight as possible.

First, a lot of haters promised me this tank wasn't going to fit because china. Well, I have a 500-mile range LC250, and they don't. 😂

I initially posted some info on the tank in question in LC Talk, under the thread Fuel Tank Options. The tank in question is here: FK NOTVUCH 110L(29 Gallon) Main Fuel Tank Fit for LC250

Price: $1230 US, plus shipping and tariffs of (for me) about $330 as I recall.

Shipping: Ships from China, they packed it extremely well and built a wood crate to protect it. It showed up flawless. Delivery took something like two months give or take.

Customer Service: Mike Lee is the Sales Manager and is a class act. Very responsive, knowledgeable, and credible. When I initially inquired about fit, they had not tested this on the US-Spec LC. But they took the question back to their tech team and concluded it would fit, and offered a guarantee if it didn't. Obviously, it worked and they are to be commended for their efforts. You can reach them via their CONTACT tab on their website.

I am attaching some photos, all-pre-install but you get the idea.

Quality: The tank is an aluminum-magnesium alloy; the TIG welds look great, the powder coat finish was good, no visible flaws. The hardware seems to be of good quality and heavy duty. The seals provided and hoses all seem to be of OEM quality at least via visual inspection. There were concerns voiced on the previous thread about buying a chinese fuel tank - I'm not going to convince you otherwise if that is what you believe, but I can tell you the quality looks and feels as good as you're going to find, and at this price point it is hard to imagine it being better.

Installation Video:
This was for me the only source of instruction; I gave a few notes to Mike afterwards and he said they will add some written instructions for a few places where I had difficulty (removing three different fuel pump connectors without being able to really see them, thread pitches being similar but not the same on some parts and unlabeled, nothing big).
It's pretty straight forward; you remove the skid plate, support the tank, remove the hangers, drop the tank a little and remove the electrical and plumbing connections, drop the tank, pull out the pump and put it in the new tank, install a few new hangers and reinstall. The process isn't difficult, it's just the tight quarters that makes it harder 😂.

I tackled this by myself, on the floor of my garage, with a jack and jack stands. I had the jack stands at their max length and it was just barely high enough to slide the new tank underneath. I'm talking just barely- like the fuel pump touched the bottom of the frame sliding it in. If you have access to an assistant, a vehicle lift, and crucially a scissor cart to support and lift the tanks up and down while you undo/redo the electrical and plumbing connections, you will have a much easier time. That said, I just proved it is possible to do without those things.

If you're wondering how i got the tanks up and down (the OEM with fuel still in it and heavy and awkward), I used a piece of plywood bolted to my floor jack, slid it underneath the tank and jacked it up. that was easy; installing was much more awkward - i used the same piece of plywood with some wood blocks under one end and slid the new tank up into position. You have to be VERY precise and close to the final landing spot to be able to make the plumbing and electrical connections. There is no more than maybe an inch of extra hose (especially the filler hose). It is extremely tight quarters and amplified if you're on your back trying to get the tank into position by yourself- again, a lift for the vehicle and scissor cart to lift the tank would make this WAY easier as shown in the video.

There are no issues with the fit of the tank. I know a lot of people were concerned about the rear suspension link being in the way because this is different from the lexus (and it's larger tank), but this isn't a lexus tank. It was designed for this vehicle.

I didn't measure the gas I transferred (with siphon pump) from my old tank to the new one, so I was unable to confirm how many gallons actually go into the tank before the pump stops. But, it was definitely north of half a tank, and I put 18.5gal in at the gas station shortly thereafter.

If you're wondering about fuel gauge, it will be wrong. The computer thinks you've got 17 gallons and you have 29. As far as I'm aware there is no good way to fix it on the dash. Further, the shape of the tank will make the relationship between the new tank and the oem tank non-linear. Eg., at full tank the ratio is about 1.7 (17:29gal). But the fuel light reportedly comes on with 4 gallons, which is a ratio of around 2 (2:4gal). So there isn't a clean / easy conversion factor you can apply to understand your remaining range. By far the simplest way is to set your trip A at refills, and set your mileage meter to "total average" instead of "trip average". That will give you the total mileage on the tank instead of the current trip. Then, just monitor your trip A miles and make some adjustment based on the mileage you're getting. I average about 19mpg, so 475 miles will be my mixed driving number to fuel light illuminating (25gal x19), and if the tank mpg is trending closer to 18 I'll go with 450 and if it is trending closer to 20 I'll go 500.

Overall this is a killer upgrade for me; makes the LC so much more functional for long trips without the hassle and expense of an aux tank. And, I will add, it's just as many gallons as you'd get with a saddle aux tank.

Ok, what else guys?

Great job . Question on total mpg calculation . Do you think that is still accurate ? I’m not sure if Toyota has some sort of flow meter or algorithm to calculate the mileage or also rely on some sort of differential reading of the tank level sense
 
This sounds awesome. Thanks for sharing this information.
What does the inside baffling look like? I asked the manufacturer, but they just pointed me to a video that wasn't helpful.
Ask and you shall receive!
 

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Great job . Question on total mpg calculation . Do you think that is still accurate ? I’m not sure if Toyota has some sort of flow meter or algorithm to calculate the mileage or also rely on some sort of differential reading of the tank level sense
I’m 100% certain it is not correct when you first install the tank. I’m fully expecting it will always be wrong and not learn or figure anything out, simply because it is faster, cheaper, and more reliable to hard code 16.9 gallons than to create a learning algorithm. Further the vendor has not indicated that the truck learns anything.

Really it isn’t a big deal. Just use the Trip A counter when you refill and plan on 450 miles, refill when the fuel light comes on. You’re just counting up instead of counting down and looking at a different spot on the display.
 
I’m 100% certain it is not correct when you first install the tank. I’m fully expecting it will always be wrong and not learn or figure anything out, simply because it is faster, cheaper, and more reliable to hard code 16.9 gallons than to create a learning algorithm. Further the vendor has not indicated that the truck learns anything.

Really it isn’t a big deal. Just use the Trip A counter when you refill and plan on 450 miles, refill when the fuel light comes on. You’re just counting up instead of counting down and looking at a different spot on the display.
I was referring to the calculated mpg. Not miles or gallons left . I’m not sure how Toyota calculates it. Maybe it is tired to direct injector duty cycle or some sort of flow meter in the pump
 
Gotta ask, what’s the “doubleD”? I mean, we basically have the same user name :LOL:

Maybe it’s the birthday beers, but I’m just now seeing the correlation and have to kno

Names might look the same but he is much more advanced than you. I mean your technical skills seem to have capped at key fob cover install according to your mods
 
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Oh, mpg! That is correct. Comes
From the fuel sender I believe and no change to that system from OEM. So no change to calculated mpg.
 
Thanks for sharing your install and experience so far.

It would be interesting to see if the fuel sending units in overseas markets have different part numbers for different fuel tank sizes and powertrains.
 
Thanks for sharing your install and experience so far.

It would be interesting to see if the fuel sending units in overseas markets have different part numbers for different fuel tank sizes and powertrains.
They very well may; but my understanding is the calculations are all done in the ecu via the canbus. So the data of flow rate (or any other data like resistance from the pump for purposes of measuring fuel level) is just data and the ECU determines what to display based on said data after doing the necessary calculations or algorithms.

In any case this tank doesn’t impact displayed mpg, only miles to empty.
And fixing MTE I believe requires modding the ecu which perhaps can be done but would surely be a custom piece of work if it is possible at all. It’s not a simple change from 16.9 to 29; there is a formula/algo to account for shape of the tank.

I know everyone wants to solve this but seriously, it’s wayyyyy easier and practical just to count up and if needed do some very basic multiplication. And, you've
Got a 4gal buffer when that light comes on.
 
I love the ignore feature of this forum.. 🙄
I saw a few from my favorite ignored member(s), one who doesn’t even own one. I assume I’m getting “dragged,” but am grateful for a feature that mutes the issue
 
Awesome upgrade to your ride! Keep us posted on how it goes.

I read on a FB forum about Scanguage 3 to more accurately measure fuel remaining for modifications to fuel tanks. I don't much about it, but might be worth checking out.

I emailed the company of your new tank to see if they have anything for the LC300 GR-S HEV... let's see what they say.
 
Awesome upgrade to your ride! Keep us posted on how it goes.

I read on a FB forum about Scanguage 3 to more accurately measure fuel remaining for modifications to fuel tanks. I don't much about it, but might be worth checking out.

I emailed the company of your new tank to see if they have anything for the LC300 GR-S HEV... let's see what they

They very well may; but my understanding is the calculations are all done in the ecu via the canbus. So the data of flow rate (or any other data like resistance from the pump for purposes of measuring fuel level) is just data and the ECU determines what to display based on said data after doing the necessary calculations or algorithms.

In any case this tank doesn’t impact displayed mpg, only miles to empty.
And fixing MTE I believe requires modding the ecu which perhaps can be done but would surely be a custom piece of work if it is possible at all. It’s not a simple change from 16.9 to 29; there is a formula/algo to account for shape of the tank.

I know everyone wants to solve this but seriously, it’s wayyyyy easier and practical just to count up and if needed do some very basic multiplication. And, you've
Got a 4gal buffer when that light comes on.
Agreed. So long as the gauge reads the level somewhat accurately, what else do you need? Some of us are old enough to have lived without DTE/MTE/cruising range and we survived.
 
Agreed. So long as the gauge reads the level somewhat accurately, what else do you need? Some of us are old enough to have lived without DTE/MTE/cruising range and we survived.
lol you just reminded me of my 83 Rx-7; fuel gauge was busted and I never once ran out of gas.
 
My experience with fuel senders and calculations for distance to empty is that none in my experience know how many gallons the tank is. They simply read the float level and it drop distance travelled to calculate DTE. Tanks level will be accurate as well only difference should fuel remaining when the light comes on.

I’d be willing to bet it over the course of a couple tanks you’ll see the DTE increase to match what your actually getting.
 
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