post 2016 79 series rear tank into 75 series (1 Viewer)

[hstath80]

Hello Everyone,

I've recently acquired a 130L vdj79 rear tank from my local tip for 10$ and was looking for advise on how to mount it. Does the factory 79 series bracket mount in?

1999 hzj75 for reference.

My car has no factory sub so no gauge or transfer pump/wiring for it either.

 

[Indestructible 47]

Degree of difficulty to make that work is going to be high (if you want a half reasonable result). Hzj75 sub from factory was 90L so it may not even fit. Either way I doubt many have tried it before so unfortunately information may be limited.

 

[hstath80]

Degree of difficulty to make that work is going to be high (if you want a half reasonable result). Hzj75 sub from factory was 90L so it may not even fit. Either way I doubt many have tried it before so unfortunately information may be limited.

Cheers, I figured as much. Just wanted to see if it was doable cause i picked the tank up for 10$, lot cheaper then the alternatives

 

[kavandje]

I have heard apocryphal stories of people putting the 130l tank in the backs of their HZJ79 single cabs. It's do-able, but it entails a bit of fabrication. The mounting points are different, and I expect that an HZJ75 is going to be different still, given the significantly shorter springs and the shorter wheelbase in the 75.

I just found a rather interesting document pertaining to specifications relevant to vehicle modifications to the 79 series (including the VDJ79), which seems like it might have information useful to you, giving fuel tank mounting point dimensions etc.

Behold: https://www.toyota-tech.eu/BBG/Land Cruiser BBG BBGJ1004/cont/pdf/BBGJ1004.pdf

 

[HZJ75 FARMER]

Hello Everyone,

I've recently acquired a 130L vdj79 rear tank from my local tip for 10$ and was looking for advise on how to mount it. Does the factory 79 series bracket mount in?

1999 hzj75 for reference.

My car has no factory sub so no gauge or transfer pump/wiring for it either.

Never tried such a project so I'm not much help, but sounds like a great idea if you can make it fit.

One thing I can add though, is that there is no transfer pump on a normal HZJ75 sub tank system. The way it works is there are two solenoid valves, one for supply and one for return. No power means fuel is drawn from and returns to the main tank. When power is applied to both solenoids they open their valves and they change the supply and return to the sub tank.

Let me know if you want more detail about this, or photos.

 

[kavandje]

Never tried such a project so I'm not much help, but sounds like a great idea if you can make it fit.

One thing I can add though, is that there is no transfer pump on a normal HZJ75 sub tank system. The way it works is there are two solenoid valves, one for supply and one for return. No power means fuel is drawn from and returns to the main tank. When power is applied to both solenoids they open their valves and they change the supply and return to the sub tank.

Let me know if you want more detail about this, or photos.

I concur with this. Somewhere I have the part numbers for these two solenoids — the same ones, or very similar ones — are also used on the HZJ105, as it happens.

You'll want to wire up a two-throw switch to operate both solenoids simultaneously. Be good to yourself and add a second fuel gauge and a little indicator light that tells you you're pulling from the non-factory tank. And you definitely want both solenoids. The 1HZ uses a significant amount of the diesel it pulls out of the tank to lubricate and cool the fuel pump; this is then returned to the tank. If you don't plumb in a second solenoid, you'll basically be pumping fuel from one tank to the other slowly and unpredictably. On long drives, no bueno.

 

[HZJ75 FARMER]

I concur with this. Somewhere I have the part numbers for these two solenoids — the same ones, or very similar ones — are also used on the HZJ105, as it happens.

Be careful with "very similar ones", there are differences such as the sizes of the barb fittings for the fuel hoses. A HZJ75 has 3/8 hose fittings for the supply solenoid and 1/4" for the return solenoid. HDJ79 uses bigger ones. Other models, I can't say.

 

[kavandje]

Be careful with "very similar ones", there are differences such as the sizes of the barb fittings for the fuel hoses. A HZJ75 has 3/8 hose fittings for the supply solenoid and 1/4" for the return solenoid. HDJ79 uses bigger ones. Other models, I can't say.

An excellent point, though I'll add that I ran the solenoids from a HZJ105 on an HZJ79 for years with no problems. I suspect a careful look at the fittings will reveal that they're basically the same thing.