Big Fuel Tank

[greentruck]

My opinion on:
SNIP
It sounds like there is no return line to the OEM subtank, except in the diesel version. I presume that it's directly plumbed into the evap system. Apparently, the OEM system deals with any difference in pressures created when the subtank is pumped into the main. I presume if a custom subtank is plumbed the same that should work the same.
Sub Tank is ventilated through dual filler neck. 2 tanks are joined there.


OK, long enough for now, some ideas on how it would work, so take soms shots at them. The tricky part will be getting the harness connections needed, while not letting the ones not needed when not doing the full OEM install get in the way.
Harness wont be that hard, if using George's ECU.

SNIP

On evap venting/capture, I was just thinking that might be the case. Solves that problem, simplifies the plumbing needed.

OK, I must've missed George having a subtank ECU. Neat! That makes this even more practical.

 

[Wheelingnoob]

I too want another 20 gallons of on board fuel, I would prefer not having the carry Jerry cans unless its a really long trip.

I would like to try and make a Isuzu Trooper tank work, the tank filler is on the correct side and with our cavernous rear spare area I think it will fit well. It would be very cool if the stock dual filler neck would work as well. Need a petrol one though for our emissions test.

 

[alia176]

I too want another 20 gallons of on board fuel, I would prefer not having the carry Jerry cans unless its a really long trip.

I would like to try and make a Isuzu Trooper tank work, the tank filler is on the correct side and with our cavernous rear spare area I think it will fit well. It would be very cool if the stock dual filler neck would work as well. Need a petrol one though for our emissions test.

The Trooper tank is a good candidate as it is a nice rectangular unit that comes with its own skid plate. I can't recall what the capacity is for this tank.

 

[Wheelingnoob]

I can't recall what the capacity is for this tank.

22.5 Gallons perfect for my needs.

 

[86tuning]

It would be very cool if the stock dual filler neck would work as well. Need a petrol one though for our emissions test.

I figure it won't be hard to make a restrictor plate and add it to a diesel filler neck. Gonna find out what they cost first, as it appears the unleaded filler necks are discontinued (according to akella).

 

[jeffro109]

Does anyone know the dimensions of the OEM subtank? Approximate length and width could be useful, then just find a depth to suit your capacity needs from other makes.

 

[alia176]

22.5 Gallons perfect for my needs.

I have bunch of these tanks in my Pick N Pull but they all have holes in them for quick draining of gas

 

[cody c]

The Trooper tank is a good candidate as it is a nice rectangular unit that comes with its own skid plate. I can't recall what the capacity is for this tank.

If you had dimensions for this tank that would be great.

I have an older diesel that doesnt require an in tank pump, so this would be a great conversion for me. Plus Ive got a friend that is getting more WVO than he can burn so it would be a nice addition. Run the truck on pump diesel, then switch over to either straight WVO or a blend when its warm.


I think Id pull the stock filler neck and weld on a "Y" section to fill the other tank, and then find a three way valve to switch between the two tanks, and maybe switch to the tank gauge on the other one.

Hopefully someone on here can get some of the legwork done and report back about the cherokee or trooper tanks, Ive got too many projects on the go to do the research right now or take on a project like this.

 

[Wheelingnoob]

I have bunch of these tanks in my Pick N Pull but they all have holes in them for quick draining of gas

Yeah I was worried about that, i cant remember ever seeing a gas tank a wreker that did not have a hole in it. The troopes are very rare up here too so finding on is goin to be a task indeed. If i can find one I would start workin on it asap, i need somthing for next year.

 

[Akella]

I figure it won't be hard to make a restrictor plate and add it to a diesel filler neck. Gonna find out what they cost first, as it appears the unleaded filler necks are discontinued (according to akella).

here is place for restrictors http://www.pciinc.com/index.php/gas/fill/pipe/restrictors/

Does anyone know the dimensions of the OEM subtank? Approximate length and width could be useful, then just find a depth to suit your capacity needs from other makes.

how i remember it is about 52-54 long and 24 wide, but i will go to my storage tomorrow and will measure one of the sub tanks is got.

 

[RC5280]

sub tank

they are 42" x 20" x 8"

 

[Akella]

Just measured one the tanks i got ant it is 40.5x19.25x7.75 that is includes the flat edge.

 

[Akella]

Wondering if something like this will fit and wont hang to low. Fuel tanks for Cherokee XJ 86 seems cheap even new.

Does any body know dimensions of 24gal MAF tank and 42gal tank?

 

[greentruck]

Wow, hard to beat $110 w/ free shipping to the lower 48. Even if you have to provide your own armor, that's really reasonable.

BTW, I checked their Isuzu offerings and no fuel tanks

 

[scottryana]

13" will definitely mean it is hanging below the frame rails though.

 

[Akella]

I know the price is a steal. Only the thing i dont like about it, that it is 20 gal only and not something like 25.

Can somebody measure the space we have inside the frame for the sub tank? Sorry guys cannot do it my self as my LC is parked outside and weather in London has been nasty for the last couple of days.

 

[greentruck]

Here are some quick and dirty measurements. I tried to account for the obvious intrusions, but may have missed something.

Width = ~40" between frame rails
= 28" directly behind rear axle x-member betw. left frame and exhaust intrusion

Length = 25" from rear axle x-member along frame to angle brace for rear x-member
= 30" rear axle x-member along frame to rear x-member

Depth = depends.

With the cited XJ tank, 13" is only about halfway down the tire tread on the front edge of the 33" KM2 skinny hanging under there. There's rough 8" from underside ribs of cargo area to bottom of frame rail. Obviously better to be totally tucked, but here I think you really start cutting into capacity. Someone who is setting up a rockcrawler may want that, so go with the little tank. For expedition use, something below the frame rail is less of an issue unless it's near the rear x-member where it'll hang up easily.

I'm going through other tanks on the same site as the XJ tank is on. Here's one:
http://www.1aauto.com/1A/Gas-Tank/Chevy/S10-Blazer/1AFGT00253/389167

For an S series Chevy Blazer, it has the fill on the correct side and has what looks like an angled cutout that would help clear the exhaust intrusion in the right front corner of the space.

I'm paging through more for other likely candidates.

Finally, has anyone priced that Isuzu tank as a new part? Probably way too expensive, but you never know. I have a previous relationship with a decent Isuzu OEM parts source and could check on that if someone else hasn't already.

 

[Akella]

isuzu new will be $500+ i just checked.

 

[scottryana]

Damn those are cheap. I was just looking at the aluminum to make a 36"x20"x4-7" tank and it was almost twice that.

 

[greentruck]

Here are some more possible candidates.

http://www.1aauto.com/1A/Gas-Tank/Jeep/Comanche/1AFGT00478/337878
23.5 gallons. For a Jeep Comanche, the fill is not ideal, but may work. Depth (13.625") may be an issue for some.

http://www.1aauto.com/1A/Gas-Tank/Jeep/Wagoneer/1AFRK00026/389631
20 gallons. Depth is a bit less at 13".

http://www.1aauto.com/1A/Gas-Tank/Jeep/Wrangler/1AFGT00470/337868
15 gallons. With a less than 11" depth, this 15 gallon tank provides good clearance. Other CJ tanks are similar and might be worthwhile for those needing max clearance.

http://www.1aauto.com/1A/Gas-Tank/Lincoln/Versailles/1AFGT00180/337019
19 gallons. Good clearance at just over 10" depth, the length and width may be just a little too big.

http://www.1aauto.com/1A/Gas-Tank/Oldsmobile/98/1AFGT00419/337798
22 gallons. A very tight fit? but if it does, you get high capacity and plenty of clearance at less than 11" depth.

http://www.1aauto.com/1A/Gas-Tank/Oldsmobile/98/1AFGT00417/180542
22 gallons. Similar form-factor, but no welded on neck.

http://www.1aauto.com/1A/Gas-Tank/Oldsmobile/CutlassCruiserRWD/1AFGT00444/337768
18 gallons. The "square" tank, definitely fits easily, although depth is just over 14".

http://www.1aauto.com/1A/Gas-Tank/Ford/Falcon/1AFGT00170/180474
16 gallons. 8" depth. Has drain plug, for those who like to plumb things so they can live dangerously...

http://www.1aauto.com/1A/Gas-Tank/Ford/BroncoFullSize/1AFGT00229/298012
33 gallons. The big one, fits but with 16" depth. For the Expo crowd.
Also available with 2" hole:
http://www.1aauto.com/1A/Gas-Tank/Ford/BroncoFullSize/1AFGT00228/337089

http://www.1aauto.com/1A/Gas-Tank/Ford/F150-Truck/1AFGT00136/436371
19 gallons. Tight and high, with 8" depth.

http://www.1aauto.com/1A/Gas-Tank/Ford/F100-Truck/1AFGT00158/437418
38 gallons. Fits, but hangs down at 13.75".

http://www.1aauto.com/1A/Gas-Tank/Ford/E150-Van/1AFGT00123/436913
22 gallons. Tight fit, but only 11.25" depth.

OK, plenty of possibilities to chew over, but I'm sure there are others, so let us know if you have a likely candidate. These are generic parts from one vendor. Please note that I make no claims that any absolutely fit. These are likely candidates, not the newly elected. Getting the plumbing options right is another sticking point. Most have a side fill, which makes most sense to me as possibly working for our purpose. I'm not totally up on what other connections might be needed, depending on how things are put together.