Paging @Mesha ... he's doing one in his, essentially copying mine. I'm not sure how far along he is though.
Auxiliary fuel tank in my LX450
- Thread starter 86tuning
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I just completed mine about a month or so ago I think that’s what I paid for the new tank. However I did have to go pull the lower brackets and fuel pump assembly from the junk yard. The S10 tank fits very well.
JaketheSSnake
SILVER Star
Is that pretty close to the frame height, or does it hang down a little? Looks pretty decent from that angle.
Oh wow, that looks awesome.
The tank straps and fuel sending unit/pump assembly are also for sale online (new). About $20 for the straps and $120 for the sending unit. Probably gonna go that route just so I don't have to leave the house right now.
Another question-- how are you guys doing the fuel management? I was thinking using something like an Arduino so it could be somewhat intelligent in transferring the fuel to the main tank. This way it wouldn't be able to overfill the main tank or run the sub tank pump when the tank is empty.
Might be too complicated, but that seemed like the easiest route to me. With all the extra time from the lockdown, I figured that doing some trial and error with writing a program might be worth it.
I did also order an OEM sub tank switch, so at least from the cab everything will look OEM.
It does hang down a bit. Here are a couple pics from when I first installed mine...you can see how far it hangs below my 4x4 Labs bumper. (which is right on the bottom of the frame)
For fuel management, I'm just using the stock in-tank pump that comes with the sending unit. A relay is energized with a little switch on my dash, built into my fuel gauge. No intelligence. If I leave it on trying to pump a dry tank, I'll kill the pump.
Here's a writeup I did on my second setup, under my 100...but essentially the same as under my 80: DIY 20 gallon auxiliary fuel tank
Page 1 has info on George's fuel transfer ECU, pretty much PnP in my book. I've been using mine since '04!! He looks for the empty signal from the sub tank to shut the power off. If the main tank is full, the fuel recircs through the vent pipes. His site has all the writeup. I have a second one if I want to do a sub tank in the 4runner
That's not bad at all. It looks OEM honestly. If all goes according to plan, I should get my 4x4Labs rear bumper in about 2 weeks so glad to see that it doesn't really hang down below it that much.
Being the geek that I am, I think I'm gonna go with the Arduino control for the sub tank fuel pump. But I will have to look into George's ECU before I do that...
I also don't have a welder so hopefully I can get away with not doing any welding. But as time goes on, and the more trucks that I build, I feel like maybe it's finally time to invest in a welder.
We shall see.
Thanks a bunch for the pics and info. Just ordered the tank, pump, straps, and rubber isolators. Gonna go find some bulk fuel hose now and some of the other miscellaneous items.
Being the geek that I am, I think I'm gonna go with the Arduino control for the sub tank fuel pump. But I will have to look into George's ECU before I do that...
I also don't have a welder so hopefully I can get away with not doing any welding. But as time goes on, and the more trucks that I build, I feel like maybe it's finally time to invest in a welder.
We shall see.
Thanks a bunch for the pics and info. Just ordered the tank, pump, straps, and rubber isolators. Gonna go find some bulk fuel hose now and some of the other miscellaneous items.
The tank hangs down roughly 2.5 inches lower than the frame. I have a 1 inch body lift which also helps tucking it up higher.
For fuel management I went very simple... for now. I used an OEM sub tank switch that powers the transfer pump. It is a little annoying since the OEM switch is momentary so I have to keep it held down. I am thinking of re-purposing a defrost switch so I can click on and just watch the aux fuel gauge for when to turn it back off.
With my Labs bumper, I was able to simply drill and tap the bumper's crossmember for the two rear mounting points.
The front got the same treatment as my 100, which does require welding.
With my Labs bumper, I was able to simply drill and tap the bumper's crossmember for the two rear mounting points.
I used Rivnuts for all four holes, as outlined by George in his detailed sub tank install. Another option for y'all!
I converted a hazard switch into a sub tank switch by taking a momentary sub tank switch and a hazard switch, took them apart and swapped the internals.
When I got my sub tank kit from AUS it cam with a momentary switch and I had a extra hazard switch on hand.
Not to hard to do and works perfect!
When I got my sub tank kit from AUS it cam with a momentary switch and I had a extra hazard switch on hand.
Not to hard to do and works perfect!
Great Idea! I’m doing that this weekend.