International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-13-2009, 07:51 PM
msh227's Avatar
msh227 msh227 is offline
Member
 
Join Date: May 19, 2009
Location: Lehigh Valley, PA
Posts: 177
Lightbulb 1978 Ford Bronco 25 gallon fuel tank swap in J10!

I have been doing some research and finally found a 25 gallon tank that will fit where the stock tank was. I couldn't find any thread on here of somebody doing something similar, maybe I just didn't know where to look for it. I liked some of the ideas about putting a 30+ gallon tank behind the rear axle but I didn't want to move my filler tube hole on my bed so I decided to try this idea.

I got a replacement 1978 Ford Bronco 25 gallon fuel tank from MTS Company. I don't like how the stock tanks were strapped to the bottom of the bed so my plan is to attach this new tank in between the frame. It will make it nice when I have to remove the bed for body work and paint. I'm using square stock as my frame for the tank and bought 1/8"X 1-1/4" steel for the straps. I plan on welding 7/16" bolts to the end of the straps in order to recreate standard fuel straps. The straps will be bolted to two cross members that will lay on top of the tank and hold the tank in place.

Here are a couple pictures of the fuel tank mock I was able to complete tonight. I picked up the needed material and got all pieces cut to size. On Thursday I'll complete the installation.

Only thing missing in these photos are the straps.











I will place a piece of 3/8" steel across the opening in the cross member for the square stock to sit on.

__________________
Matt

1978 J10 5.3L/700r4/QT swap in progresss....

37x14.50R15 TOYO Open Country MT
4.56 Gears
6" Bjsoffroad Lift
3" Body Lift
Mile Marker Part-time 4wd Kit

1978 J10 Build Thread:
http://www.ifsja.org/forums/vb/showthread.php?t=108566
Reply With Quote
  #2  
Old 10-14-2009, 12:32 AM
FSK1460's Avatar
FSK1460 FSK1460 is offline
Member
 
Join Date: Aug 20, 2004
Location: Tulsa, OK
Posts: 164
I was considering using one of these tanks on my Grand Wagoneer down the road. Was curious, what model sending unit are planning on using? And does is register correctly on your gauge? I thought I read somewhere the ohm readings were different depending on model.
__________________
____________________________________________
1990 GW: Borla Turbo XL muffler, MSD 6A, Blaster Coil
Rebuilt 360 with RV cam. Edelbrock 1406 and Performer Intake
TH727, NP229, 3.73's with 31' BFG's. BJ's 4" lift with Rancho 9000's
BJ's Aluminum radiator
Black with Burgandy interior.
Tulsa, OK
Reply With Quote
  #3  
Old 10-14-2009, 05:11 AM
msh227's Avatar
msh227 msh227 is offline
Member
 
Join Date: May 19, 2009
Location: Lehigh Valley, PA
Posts: 177
I actually bought the sending unit through MTS Company. It sounds like they make their own sending units, I'm assuming they replicate the original sending units that Ford used. I was told when I ordered the tank that the ohms are the same and it would work perfectly. Hopefully that is helpful.

There is only one downside to the sending unit MTS Company had available. I will need to shorten it because it is a sending unit for the Ford Bronco's 33 gallon tank. MTS doesn't make a 25 gallon sending unit but this will fit with just a little minor trimming.
__________________
Matt

1978 J10 5.3L/700r4/QT swap in progresss....

37x14.50R15 TOYO Open Country MT
4.56 Gears
6" Bjsoffroad Lift
3" Body Lift
Mile Marker Part-time 4wd Kit

1978 J10 Build Thread:
http://www.ifsja.org/forums/vb/showthread.php?t=108566
Reply With Quote
  #4  
Old 10-14-2009, 06:28 AM
flyusmc's Avatar
flyusmc flyusmc is offline
Member
 
Join Date: Oct 24, 2007
Location: Pasadena, MD
Posts: 164
FSK1460,

When I swapped my 32 gallon Bronco tank, I swapped out and used the stock 88 Wagoneer sending unit. It had to be bent a bit to register normal, but it works just fine.

-FLYUSMC



Quote:
Originally Posted by FSK1460
I was considering using one of these tanks on my Grand Wagoneer down the road. Was curious, what model sending unit are planning on using? And does is register correctly on your gauge? I thought I read somewhere the ohm readings were different depending on model.
Reply With Quote
  #5  
Old 10-14-2009, 09:15 PM
FSK1460's Avatar
FSK1460 FSK1460 is offline
Member
 
Join Date: Aug 20, 2004
Location: Tulsa, OK
Posts: 164
FSK1460,

When I swapped my 32 gallon Bronco tank, I swapped out and used the stock 88 Wagoneer sending unit. It had to be bent a bit to register normal, but it works just fine.

-FLYUSMC



Did the Wagoneer sending unit mount in the same? I know they have the big nut that screws on top holding it in place, but looking at the pictures of MTS's tanks, you can't see any threads for one.

And what exactly is the "EMS" hole for? Looks like you can buy some tanks with or without it.
__________________
____________________________________________
1990 GW: Borla Turbo XL muffler, MSD 6A, Blaster Coil
Rebuilt 360 with RV cam. Edelbrock 1406 and Performer Intake
TH727, NP229, 3.73's with 31' BFG's. BJ's 4" lift with Rancho 9000's
BJ's Aluminum radiator
Black with Burgandy interior.
Tulsa, OK
Reply With Quote
  #6  
Old 10-15-2009, 05:49 AM
threepiece threepiece is offline
350 Buick
 
Join Date: Sep 17, 2005
Location: Farmington Hills Mi.
Posts: 1,195
Quote:
Originally Posted by msh227
I have been doing some research and finally found a 25 gallon tank that will fit where the stock tank was. I couldn't find any thread on here of somebody doing something similar, maybe I just didn't know where to look for it. I liked some of the ideas about putting a 30+ gallon tank behind the rear axle but I didn't want to move my filler tube hole on my bed so I decided to try this idea.

I got a replacement 1978 Ford Bronco 25 gallon fuel tank from MTS Company. I don't like how the stock tanks were strapped to the bottom of the bed so my plan is to attach this new tank in between the frame. It will make it nice when I have to remove the bed for body work and paint. I'm using square stock as my frame for the tank and bought 1/8"X 1-1/4" steel for the straps. I plan on welding 7/16" bolts to the end of the straps in order to recreate standard fuel straps. The straps will be bolted to two cross members that will lay on top of the tank and hold the tank in place.

Here are a couple pictures of the fuel tank mock I was able to complete tonight. I picked up the needed material and got all pieces cut to size. On Thursday I'll complete the installation.

Only thing missing in these photos are the straps.









I will place a piece of 3/8" steel across the opening in the cross member for the square stock to sit on.

For some reason the pictures aren't showing but it seems you are welding two crossmembers to the frame and attaching the straps to them. I think Jeep mounted the tank to the bed floor to minimize the effect of frame twist. I am planning a custom fuel tank and am considering two brackets that are attached to one frame rail. The straps would then be attached to the brackets. This I think would help to isolate the tank and structure from twist.
Dan
__________________
FSJ Hybrid build thread: http://www.shopfloortalk.com/forums/...ad.php?t=43332
We are Borg, but we don't know it yet.
We are being assimilated but we don't know it yet.
Resistance is not futile yet.
Are you and your children connected yet?
Reply With Quote
  #7  
Old 10-15-2009, 03:04 PM
msh227's Avatar
msh227 msh227 is offline
Member
 
Join Date: May 19, 2009
Location: Lehigh Valley, PA
Posts: 177
Got the tank installed today and everything painted. I'm really happy with the way it turned out. Ran into one issue with the Ford sending unit. There is no return line/vapor line back into the sending unit. I'm guessing that is what it is for. The Ford sending unit only had the feed line no return line. Here are some pictures of the final setup.





__________________
Matt

1978 J10 5.3L/700r4/QT swap in progresss....

37x14.50R15 TOYO Open Country MT
4.56 Gears
6" Bjsoffroad Lift
3" Body Lift
Mile Marker Part-time 4wd Kit

1978 J10 Build Thread:
http://www.ifsja.org/forums/vb/showthread.php?t=108566
Reply With Quote
  #8  
Old 10-15-2009, 03:06 PM
msh227's Avatar
msh227 msh227 is offline
Member
 
Join Date: May 19, 2009
Location: Lehigh Valley, PA
Posts: 177
Quote:
Originally Posted by threepiece188
For some reason the pictures aren't showing but it seems you are welding two crossmembers to the frame and attaching the straps to them. I think Jeep mounted the tank to the bed floor to minimize the effect of frame twist. I am planning a custom fuel tank and am considering two brackets that are attached to one frame rail. The straps would then be attached to the brackets. This I think would help to isolate the tank and structure from twist.
Dan

Let me get this straight. You plan on on running the straps around the entire tank and having it fastened on to the frame with the two brackets? Just trying to visualize your description.
__________________
Matt

1978 J10 5.3L/700r4/QT swap in progresss....

37x14.50R15 TOYO Open Country MT
4.56 Gears
6" Bjsoffroad Lift
3" Body Lift
Mile Marker Part-time 4wd Kit

1978 J10 Build Thread:
http://www.ifsja.org/forums/vb/showthread.php?t=108566
Reply With Quote
  #9  
Old 10-16-2009, 04:33 AM
threepiece threepiece is offline
350 Buick
 
Join Date: Sep 17, 2005
Location: Farmington Hills Mi.
Posts: 1,195
Quote:
Originally Posted by msh227
Let me get this straight. You plan on on running the straps around the entire tank and having it fastened on to the frame with the two brackets? Just trying to visualize your description.

Something like that. I plan on creating a cantilever design using two support brackets or arms if you wish, that will attach to one frame rail. The fuel tank will then be attached to those arms with straps in much the same way it originally was. By not attaching to the opposite frame rail, I believe I will isolate the tank and support structure from most of the frame twist. If you have a chance to look at a 1970's Wagoneer or Cherokee you will notice the front fuel tank mount is also of a cantilever design.
Dan
__________________
FSJ Hybrid build thread: http://www.shopfloortalk.com/forums/...ad.php?t=43332
We are Borg, but we don't know it yet.
We are being assimilated but we don't know it yet.
Resistance is not futile yet.
Are you and your children connected yet?
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:41 AM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
corner corner