Auxiliary tank

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ghcoe
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Auxiliary tank

Post by ghcoe »

When I purchased my Cherokee I was given a auxiliary tank. From my research I believe it is a Trailblazer (Trail-Blazer) tank. It came with a few parts, but I am not quite sure how it all goes together. Any help would be appreciated.

https://imgur.com/cA4quie

https://imgur.com/IO9MmKl

https://imgur.com/v8g0Kc0

https://imgur.com/c7L5NXF

https://imgur.com/Fo30UW4
Last edited by ghcoe on Sun Dec 31, 2017 8:46 pm, edited 1 time in total.
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MadMax78
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Re: Auxiliary tank

Post by MadMax78 »

From the looks of it, it will go where the spare tire is\was. I believe it is gravity fed from the main tank but am unsure of how it goes after that. I know the powers that be will chime in and give you all of the details you kneed as well. You can also do a search on here and IFSJA and get more info as well. Good luck with the install.
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tgreese
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Re: Auxiliary tank

Post by tgreese »

It definitely fits in the spare tire well, under the rear floor. I have a tank similar to that in my J20. I would expect the filler to come up to a neck and cap in the rear quarter panel. Look under the Jeep and you will see whether the cut corners go to the front or the rear. The filler also has a vent tube that comes up parallel to the filler, and vents the tank while filling. Yiu can see the level sender on top - that's the plate with the 6 screws. These tanks have a gas pickup, return, and usually a vapor recovery connection.
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hagar
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Re: Auxiliary tank

Post by hagar »

In the original Trailblazer installation, there was a connecting fill hose between the two tanks.
So the original fill neck was used, and as gas went into the aux tank first, as it filled, it then overflowed into the stock tank.
Made fill-ups a real challenge.
I don't see another filler hose size inlet/outlet on the tank, maybe out of view ?
Maybe it's been modified.
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ghcoe
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Re: Auxiliary tank

Post by ghcoe »

Sorry I just realized only one picture was working. So from what the person told me that I purchased the Jeep from is that the plastic fitting fit into the original tank line. I looked under and it looks like it would fit after I cut a section out of the metal line and looks correct as show in the lower pictures. He did say one tank was suppose to fill before the other. In this application I do not see how it would work. I can only see one inlet a vent line and a pickup (center?) and a return, plus one extra? Maybe the way the T fitting goes down and then up might make a difference in which fills first?
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berettajeep
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Re: Auxiliary tank

Post by berettajeep »

This is what is in my '74 Cherokee.

The main feed to the engine from both my tanks goes directly to a 3 way ( 2 in and 1 out) valve on the drivers side floor board, I choose which tank to draw from. The fuel gauge was spliced just outside the fuse block in the engine compartment and a toggle switch to choose which tank on the dash.


Mine is a pain in the butt. Takes a long time to fill. Since Oregon does not trust people to fill their own vehicles ( :banghead: ) I have to tell the attendants use the slowest setting ( Since they all walk away) or just use a pen, dog biscuit ( Yep, they do!) and let it trickle in.

I need to find new rubber hoses for mine too.

I did grab another filler neck from a '78 Cherokee Chief. It is metal, where my '74 was plastic. One day I'll add it so I can fill each tank separately.


As luck would have it I removed my interior tire carrier yesterday to cleanup and add bolts to hold it rather then small screws. Snapped this photo showing how mine is set up.

Image
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Last edited by berettajeep on Mon Jan 01, 2018 7:01 pm, edited 3 times in total.
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berettajeep
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Re: Auxiliary tank

Post by berettajeep »

The tank. Single strap holding it in. My tank is slightly different. I think it is square at all 4 corners compared to the one in the first post.

Image
http://www.fsjnetwork.com/forum/downloa ... ew&id=5706


The plastic 3 way. I believe this is one of the reasons it is so slow to fill.

Image
http://www.fsjnetwork.com/forum/downloa ... ew&id=5707

Bottom view of the 3 way valve where the fuel lines from the tanks go. I have dual exhaust, that is one reason for the fuel line heat shield sleeve.

Image
http://www.fsjnetwork.com/forum/downloa ... ew&id=5708

Top view. Drivers side floor.

Image
http://www.fsjnetwork.com/forum/downloa ... ew&id=5709

When I first got the Jeep I had no idea what this was. Finally dawned on me one day, PT/ FWD= Pointing Forward. PT/ RT= Pointing right. This is in reference to the position of the 3 way valve on the floor.

Image
http://www.fsjnetwork.com/forum/downloa ... ew&id=5710

Where whomever in the past spliced into the fuel gauge wire for both tanks.

Image
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Last edited by berettajeep on Mon Jan 01, 2018 7:07 pm, edited 1 time in total.
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ghcoe
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Re: Auxiliary tank

Post by ghcoe »

berettajeep wrote:This is what is in my '74 Cherokee.
Looks like you photo's did the same thing mine did. Had to do away with the IMG tag so the links would work.
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berettajeep
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Re: Auxiliary tank

Post by berettajeep »

ghcoe wrote:
berettajeep wrote:This is what is in my '74 Cherokee.
Looks like you photo's did the same thing mine did. Had to do away with the IMG tag so the links would work.
Are my photos not showing up? They are working for me.
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ghcoe
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Re: Auxiliary tank

Post by ghcoe »

berettajeep wrote:Are my photos not showing up? They are working for me.
Checked both browsers and I see a "x" on one and "image" on the other.
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ghcoe
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Re: Auxiliary tank

Post by ghcoe »

berettajeep wrote:This is what is in my '74 Cherokee.

Thanks this is a big help

The main feed to the engine from both my tanks goes directly to a 3 way ( 2 in and 1 out) valve on the drivers side floor board, I choose which tank to draw from.

This valve was included with my tank. I don't think I am going to use it though because I am going to run two electric pumps. One pump for each tank switched by a "on","off","on" toggle. I will use a T fitting in the supply fuel line and add one way inline fuel valves to keep fuel from flowing from one tank to the other depending on which pump is operating.

I was told that the return line from the carb still just returned back to the original tank, which would always keep filling that thank no matter which tank you were pumping from. So I assume that the auxiliary tank would become the main tank and the original would be the reserve tank. if it worked that way. I would think this could be why it could be hard to fill (Jeeps from this era are hard to fill anyway). Trying to make that turn in the T fitting would be difficult I would think. I might try to run the fuel return line to the Aux tank and flip the idea around. Then it would flow, like normal, into the original tank when filling at the station. Worth experimenting with.


Mine is a pain in the butt. Takes a long time to fill. Since Oregon does not trust people to fill their own vehicles ( :banghead: ) I have to tell the attendants use the slowest setting ( Since they all walk away) or just use a pen, dog biscuit ( Yep, they do!) and let it trickle in.

I just read where some counties, under 40,000, in Oregon will allow people to pump their own gas... :-bd https://jalopnik.com/join-america-in-la ... socialflow

I need to find new rubber hoses for mine too.

http://www.fillernecksupply.com/?gclid= ... gLykvD_BwE

I did grab another filler neck from a '78 Cherokee Chief. It is metal, where my '74 was plastic. One day I'll add it so I can fill each tank separately.

I have one too. I just don't want to cut holes in the side of my jeep. Besides if not done right I think it look terrible.


As luck would have it I removed my interior tire carrier yesterday to cleanup and add bolts to hold it rather then small screws. Snapped this photo showing how mine is set up.

Lucky me... I was wondering how they ran the vent line. I thought under the body to where it goes into the main tank. Not much room there. This makes a lot more sense. Thanks for taking the time to take and post up these pictures. George.
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berettajeep
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Re: Auxiliary tank

Post by berettajeep »

No problem George, glad I could help.
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bkilby
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Re: Auxiliary tank

Post by bkilby »

I got a NOS Trailblazer from a buddy of mine a few months ago. I don't know what year it was intended for but I put it in my '74 Cherokee. It came with a couple of small brackets that didn't align with my Jeep so I cut those off and made my own mounts. It also had a tube at the front that would overflow into the stock tank but that tube was pointing at the cross member (not usable) so I cut that off as well. The tank came with a 12V solenoid, switch and wiring to switch between the two tanks. But since I'm just running this tank only, I didn't use the solenoid etc. I also installed a Tanks Inc fuel pump.

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bkilby
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Re: Auxiliary tank

Post by bkilby »

Here's the instructions that came with the tank in case anyone is interested.

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tbrasse
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Re: Auxiliary tank

Post by tbrasse »

I really need a new sender for the trailblazer. I have the SAME exact tank as bkilby above. I have everything except the sender. I do not think calling trailblazer for a replacement is an option, but I wish it were. Anyone know of a replacement unit that fits and has the same range of ohms?
Much appreciated.
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tgreese
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Re: Auxiliary tank

Post by tgreese »

You can buy universal sender from Summit Racing. These adjust for tank depth. The Ohms range is standardized; just match what's given in the TSM.
https://www.summitracing.com/search/par ... fuel-level
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Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
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weeegoneeer
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Re: Auxiliary tank

Post by weeegoneeer »

Wait - aux tanks can have a sender? I have a Northwest Metal Products aux tank that came with mine and have NO idea how it works / when the fluid transfers. There is a switchable pump between the tanks, but never use it and frequently fill 30+ gallons. I do know that when I'm empty I'm empty though!

That Trailblazer tank looks sick.
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Re: Auxiliary tank

Post by 78 WIDETRAC »

bkilby Many thanks for that info! My jeep also has the trailblazer tank and I was unsure of the toggle switch wiring.
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