• Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.

Gas tank Filler insert measurement

O

Old67CJ5

New Member
Joined
Jul 20, 2026
Hey I have a 67 CJ I just bought. The previous owner put a steel tub on it but still has the tank under the seat. It's a nightmare to put gas in plus I want to keep the tank in the original location. I bought the inlet and will cut out the opening but I know there isn't much room for error to get things to line up. A stencil would be awesome but I can't find one on the net. I don't know anyone that has a CJ5 that I can make one from so I'm looking for ideas.

I have looked at several pictures and the bottom looks uneven on all the pictures I find. I know relocating the tank is big on CJ's but has anyone ran into this and has advice? I could maybe wait for a car show or Jeep gathering but being new I'm not in the loop yet. Thanks

best filler pic.webp
 

Attachments

  • 483564403_655363973657828_7319948948580331398_n.jpg
    483564403_655363973657828_7319948948580331398_n.jpg
    91.2 KB · Views: 20
Where did you get the picture of the blue Jeep?
I'd guess the tank is not located correctly in the blue Jeep.
The neck is supposed to be centered in the hole, and there is a big grommet to keep any spilled gas out of the Jeep.

As I understand you, the green Jeep is yours and the blue Jeep is an example that you posted.
You have a tank under the seat but the filler is currently between the body and the seat?

Somebody here should be able to provide some measurements.
Lacking that, I would make a cardboard template from the inside surface of the body, same size and shape.
Then on the bench, remove your tank and mock up the new opening with the cardboard and the inlet body part.

Another option would be to skip the under-seat tank and put a tank under the rear.
Lots of example of that - no gas smell, no spillage, about 50% more fuel capacity, safer.
Mike Boyink's coverage of this is fairly thorough - only in archive now https://www.earlycj5.com/index.php?threads/140391/post-1540189
Can be done with all new parts.
 
Last edited:
Thanks most of the picks I can find look just like the silver jeep and look off center. Yes the OD green one is mine and the nozzle is between the seat and the tub right now so the tank is cocked to get to the opening to fill it. If I could find a CJ5 it would be easy but I don't know of any or see any in my area. I guess it's 55- 70 that had those type tanks under the seats.

I definitely want the tank under the seat because the frame and all is in real good shape and I want to make it very close to original. I ride and old Road King so there isn't much difference between Harley cologne and Jeep cologne.......lol

After you saying the bottom line should be straight searched the web (even more) and many are crooked having the front more of a gap than the rear........and some are not. I'm starting to think it was not a critical tolerance as they were built or maybe they vary due to the specific tank neck and gas tank fitment?

Here is a stock1967 I found and it is one a the few that appear to be straight. So maybe all I need is that gap distance at the bottom? Then eyeball the L & R.

yet another gas.jpg
 
Here is another pic I got off this site and the red Jeep sure looks stock and it's crooked as well. So I think it's random. Could anyone please give me that distance in the middle that I marked on the silver jeep? I think that would do it.
 

Attachments

  • rust.jpg
    rust.jpg
    774.8 KB · Views: 11
  • gap for tank.jpg
    gap for tank.jpg
    411.5 KB · Views: 11
Last edited:
Give it some time and you'll get some responses.
 
Here’s a pic of the way mine sits on my ‘70.

1785174696892.jpeg

1785174732315.jpeg

As Tim mentioned above, there is a grommet the neck fits through and it’s pretty much centered.
 
From what i've seen at shows. An aftermarket tank in and aftermarket tub will not be centered. Aftermarket tank in original tub and stock tank in aftermarket tub will also be off.
 
That makes sense. I guess a template may not really help. I'm not sure which tub it is I just know it's an aftermarket by condition plus there is no raised jeep logo on it. I'll put the tank in and see where the neck hits the side of the tub and try to work backwards from there I guess. That way I can start with a smaller hole just for the spout to stick through and adjust the hole for the insert as needed. I have a little wiggle room for error since the lip of the insert is almost 1/2 inch or so. I got the insert and grommet from Kaiser Willys so it's really down to making cuts and welding. Thanks
 
Got the hole for the filler insert cut out and ready to weld in. Just need to weld it in place with some rosette welds and put the rubber seal around the neck. Welding it will mess the paint up but eventually I want to get it painted. Unless someone has an idea that won't wrinkle the paint? I'm all ears.......lol

Next seat and then rims and tires.

Before

before tank fix .jpg

After

Filler inlet cut in.jpeg
 
The original JB Weld is an epoxy with a powdered steel filler.
The iconic product that is sold to body shops is from 3M: https://www.summitracing.com/parts/tes-7100001224
The Eastwood product Duffer posted has similar packaging and use ... may be the same thing under private label.
The 3M product is sold to body shops, and is intended to be used with disposable nozzles and an applicator gun that dispense a pre-mixed bead of adhesive.
Meant for multiple uses at a body shop.
JB weld sells small-package panel adhesive that may be more suitable for this job: https://www.amazon.com/J-B-Weld-AutoWeld-25ml-Tan/dp/B0BX4PTZQ1?ref_=ast_bl_cpl_dp
 
I have used black silicone to glue filler pieces like floor plugs or a paint can lid to fill the filler neck on the boys 70in with good results.
 
You must log in or register to reply here.
Back
Top Bottom