Dual tank system on my '94 4Runner

[Blizz]

Hello,

I've thought you may find interesting what I'm doing in my '94 Toyota 4Runner 3.0 Turbo Diesel.

As on the gas version, the stock tank it's quite small, something like (17.17gal). With the SAS and so, we planned to put the muffler where the spare wheel used to be and add another stock tank in the opposite side of the stock one. This was cool because the weight was centered and between the axles, but proved to be a PITA to run a 2.75'' exhaust between the tanks and the rear driveshaft.

So we choose to take another direction. Here in Europe you're not allowed to install a non-certificated tank like a Long Ranger or a custom made one but it's legalizable to use a stock tank from another vehicle as it has been tested before. So I was thinking and as I use to do, searched the "remain-Toyota" solution. I noticed that the Toyota 70 series with leafs had the tank between the rear leafs and behind the axle. Althought the axles aren't the same the leaf separation is, so I had to test. I used to get a LJ-70 tank (Coiled version of 70 series, same tank as for the EPC) for 50$ and started to work. This tank it's 90 liters, this is almost 24 gal.

Also, at it's a Toyota tank (We've still to check) I'm sure we'll be able to switch between both sending units and make them work with the stock needle.

This is the tank as I got it:

We removed the crossmember that used to hold the crane for the spare wheel and tucked the tank up

We added a crossmember to protect the tank (Engineer said it was a must for legalize). You can also see the unfinished rear bumper

This is the area were the spare was, with the crossmember removed:

 

[Blizz]

Making the tank support

The front tank hanger

This is the tube coming from the aux tank. We notched the body to clear it.

 

[Blizz]

Tucked up it doesn't seem to be 24gal.

Cutted the exhaust to route to exit behind the rear wheel

We'll add a thermal insulation

Here the tank crossmember is bolted and fitted inside the frame

This is the nice dual filler we made with the stock LJ-70 one

 

[Blizz]

Modifying the filler bracket

Almost finished filler

Plumbed all together

Exhaust modified to exit behind the wheel

 

[Blizz]

Filler

As it has a "Y" shape...

...pointing to the right you fill the stock tank...

...and to the left the new one

As the injection pump on diesels suck the gas from the tank we're using two solenoids to select which tank you want, one for the engine feeding and the other for the injector return line.

Hope you like it. I'll update when I've more pics.

David

 

[Carlyle]

Awesome work!

 

[ntsqd]

I would encourage the use of under tank straps as the tank was designed to be mounted. I fear that over time the weight of the tank & fuel will tear the flange loose from the rest of the tank body.

 

[Blizz]

Yes, this is what I said to my friend but we didn't have the latches. If you look at the pics you'll notice that we used a lot of small bolts altought in the pics there're only a few bolted on.

David