Waiting for mine as we speak, they had the New Years holiday in Feb for at least half a month
29gal Main Fuel Tank Install
- Thread starter doubleD
- Start date
This is their connection diagram. (The 60L auxiliary fuel tank for LC250 is identical to that for X700H in terms of accessories and connection methods, except for the tank body and capacity.)
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It does appear somewhat "neurotic" in its initial state, jumping back and forth repeatedly.
Both the main and auxiliary tanks are full. The engine draws fuel from the main tank, but because of the siphon system, the aux tank is continuously feeding fuel back into it.
A simple way to think about it: you're basically driving while the tank is being “refilled” at the same time.
So what happens is:
The main tank level starts to drop, then gets topped back up by the aux tank. This causes the float to move up and down slightly, and the gauge may drop a bit and then rise again — usually for a couple of cycles (2–3 times).
MTE (range) will also fluctuate during this phase, since the ECU is still calculating based on the stock tank logic and has no idea there's extra capacity.
Once the auxiliary tank is empty, everything goes back to normal:
Fuel level drops steadily
Gauge becomes stable
MTE stabilizes
Welcome to the asylum.
Doe the DTE increase after multiple tanks? Or does it tend to stick it right around 300 miles?
I guess this neurotic behavior is probable preferable to behavior with a replacement
Larger main tank with it fuel light going on way too early with 5 + gallons left.
I guess you could say in my instance anyways I’d prefer some weirdness at the beginning of the tank and some weirdness at the bottom of the tank when it really matters.
I’m just about out of factory 3 yrs 36k mile warranty on mine implant to order this when I get close.
Questions for those running either:
- How accurate/trustworthy is your gauge and DTE in real-world use?
- 29 gal - Seems pretty accurate as reported by users. I've noticed it's almost a bit more linear than stock which on most cars out there including the LC, sits at full forever then starts draining quicker and quicker. This seems to sit full for a little bit, not nearly as long as OEM, and has a real nice linear emptying to it, and with only 2 or 3 fill-ups seems to show the fuel light with about 5 - 6 gals left.
- On the 29-gal tank, how early does the low fuel light actually come on, and how do you manage it?
- I think of it like this; If I was still running the 16/17-ish gal OEM tank and the light came on w/ 5-7 gal left, that would definitely be early. However, I remind myself that I bought it for towing and having a light that comes on with 5-7 gal left is just fine.
- Any install headaches or things you’d do differently?
- Nothing I would or could do differently, just note that disconnecting and reconnecting things on top of the tank is a pain in the butt.
Woo Hoo! Got a call from the shipping company, 12gal Aux tank is scheduled delivery for tomorrow!
Oredered: 24 Jan 26
Scheduled delivery: 3 Mar 26.
For anyone ordering directly from FK/Alibaba, They do not use a conventional tracking number (at least what the carriers in the US use), They use a "Card Delivery Code" (tracking number) this caused great confusion, when I called the shipping company and tried to schedule my delivery, as they had no record of my phone number or order number. After contacting Alibaba, they provided the Card delivery code and I called the shipper back and convinced them to please try the weird code (their words, not mine) and what do you know my order popped right up.
If anyone orders a tank, it was very beneficial setting up an account with Alibaba, as that was the only reason I got an email about the shipping company.
It's been a long wait.......
Oredered: 24 Jan 26
Scheduled delivery: 3 Mar 26.
For anyone ordering directly from FK/Alibaba, They do not use a conventional tracking number (at least what the carriers in the US use), They use a "Card Delivery Code" (tracking number) this caused great confusion, when I called the shipping company and tried to schedule my delivery, as they had no record of my phone number or order number. After contacting Alibaba, they provided the Card delivery code and I called the shipper back and convinced them to please try the weird code (their words, not mine) and what do you know my order popped right up.
If anyone orders a tank, it was very beneficial setting up an account with Alibaba, as that was the only reason I got an email about the shipping company.
It's been a long wait.......
i was about to ask how people have been paying as they currently cannot accept paypal..
I bet they'll take Alipay
FX or FK? Yeah it was definitely clear while trying to track that it wasn't FedEx or UPS! lol
ya... i didnt wanna be the first one to do that.. if several people have at this point id consider itI bet they'll take Alipay
Yeah the Alipay was fine, FK is a legit business not a scam lol
Quick update on 12 gal aux…
I seem to have passed the “sporadic” portion of the tank and am now in the linear decline from full.
Will provide another update once I get through the first full tank.
Quick impression right now is that while the sporadic bouncing around is a bit annoying I’ll likely learn to just ignore it until I get to the linear decline once aux is empty.
I seem to have passed the “sporadic” portion of the tank and am now in the linear decline from full.
Will provide another update once I get through the first full tank.
Quick impression right now is that while the sporadic bouncing around is a bit annoying I’ll likely learn to just ignore it until I get to the linear decline once aux is empty.
They took PayPal for my payment. It was convoluted…….. FK chat, explained I wanted the 12 gal tank vs the 16, they then sent me a link to Alibaba site for the 12 gal aux tank, I placed the order, paid on the link, confirmed the order, paid with PP IF I remember the details correctly. I posted some where on the exact process (when it was still fresh in my mind)
I got the email from the Alibaba chat person.
12 Gal tank was delivered, well packaged and undamaged. The wooden crate was well built and very light for it's size. I easily picked it up and set it on the dolly. Took a hammer and prybar to de-crate it. Contents matched the bill of lading. Absolutely no written instructions, nice sticker tho'. One bright point of this process so far, No customs paperwork!
Now I just need to wait till the fuel level drops to "zero" miles/ past empty, in the LC and a sunny, calm day to drop the OEM tank, remove the pump/sending unit and make the fuel pump cage modification. I've obtained a new tank "O" ring for the reinstall of the fuel pump/sending unit.
My plan is to drop the OEM tank completely, see if I can modify the GX 550 tank with a carefully applied heat gun and if that's successful, install the GX tank vs the LC tank. It's probably going to be a multi day process as I'm not 100% sure the GX tank's fittings are the same orientation as the LC (I know at least one of then isn't from my previous attempt at the GX tank swap). Hopefully the 12gal hoses/parts will be long enough to route to the GX's fittings as the actual fittings/quick connects are identical.
Now I just need to wait till the fuel level drops to "zero" miles/ past empty, in the LC and a sunny, calm day to drop the OEM tank, remove the pump/sending unit and make the fuel pump cage modification. I've obtained a new tank "O" ring for the reinstall of the fuel pump/sending unit.
My plan is to drop the OEM tank completely, see if I can modify the GX 550 tank with a carefully applied heat gun and if that's successful, install the GX tank vs the LC tank. It's probably going to be a multi day process as I'm not 100% sure the GX tank's fittings are the same orientation as the LC (I know at least one of then isn't from my previous attempt at the GX tank swap). Hopefully the 12gal hoses/parts will be long enough to route to the GX's fittings as the actual fittings/quick connects are identical.
BEWARE! I forgot to mention this in my review of the 29 gal main tank, nor does it show it on the FK video, but the forward most oem fuel line ( not in the rear by the sender/pump, but literally forward end of tank on the top) will have pressure in it! I think I got maybe half a mason jar worth of fuel out it?
It’s gonna go great! Have fun and can’t wait to hear how it turns out.
Attachments
Please be aware of high-pressure fuel in the fuel supply line (the line feeding the engine, as you already know), and take appropriate precautions when working on it.
Also, note that you will need to remove the bracket for the transfer case. Please make sure you have the proper tools prepared in advance to support it safely during the process.
Quick update on 2nd tank.
There was not any sporadic in between stage this time.
It would get down to around 190 and then fill back up. Did this about 2 times. I still have some of the 2nd tank in there so will see how if there’s any funny business.
Closing in on about 500 miles for this tank.
There was not any sporadic in between stage this time.
It would get down to around 190 and then fill back up. Did this about 2 times. I still have some of the 2nd tank in there so will see how if there’s any funny business.
Closing in on about 500 miles for this tank.
