Vintage Mustang Forums banner

1 - 17 of 17 Posts

·
Registered
Joined
·
6,625 Posts
Discussion Starter #1
Hey Guys,

Does anyone know if a 22 gal. fuel tank from a '70 Mustang will fit in our early Mustangs ('65-68") without modifications. My fuel cell is reaching it's EOL, sadly.....
 

·
Premium Member
Joined
·
5,793 Posts
Yes, the tank itself will fit with no mods, but you give up a little trunk space depth. You will need another sending unit for it, and the fill tube you have now can either be shortened or get a new one. Suggestion, be sure to use a good thickness of 3M Strip Calk around the perimeter to prevent leaks. One strand won't cut it, you need like four strands thickness to meet the spec and prevent leakage of fumes inside.

This is a very popular upgrade and increases the fuel range by over 37%. Very nice!
 

·
Registered
Joined
·
1,764 Posts

·
Registered
Joined
·
6,625 Posts
Discussion Starter #5
Thank guys! What can I say, but, thanks for your tips and comments.
 

·
Registered
Joined
·
6,625 Posts
Discussion Starter #6
I've got a spectra 22 gal tank in my '65. Great if you're road tripping lots!!
Regarding the fuel filler pipe.....did you shorten your original pipe due to the added height of the tank? If so, how much?
 

·
Registered
Joined
·
1,531 Posts
Regarding the fuel filler pipe.....did you shorten your original pipe due to the added height of the tank? If so, how much?
I shortened my filler neck, but cut it wrong and had to go back and make a new one. You don't have to cut very much off, but he angle is important.
 

·
Registered
Joined
·
1,531 Posts
One strand won't cut it, you need like four strands thickness to meet the spec and prevent leakage of fumes inside.
Can you elaborate on this a little? Aren't fumes more likely to come from the filler neck than to come from the exit port? Or are you referring to exhaust fumes?
 

·
Registered
Joined
·
6,625 Posts
Discussion Starter #9
I think this in reference to exhaust fumes leaking into the trunk. The thicker the “ bedding” compound, the better the the seal.
I tripled my sealing (3M Rope) 14 years ago when I installed my Fuel Cell. Fuel fumes, are ever slightly present as our old cars are not totally closed systems, line modern vehicles. Obviously, discounting leaks.
 

·
Administrator
Joined
·
13,004 Posts
I used one rope 14 years ago with never a problem.
Stan
 

·
Premium Member
Joined
·
5,793 Posts
I used one rope 14 years ago with never a problem.
Then you got lucky, Stan. The first tank I installed was a 16 gallon and I saw a Youtube video that showed using a single strand. Then I read a thread saying that wasn't enough so I put a light in the trunk and closed the lid. Then I turned off the lights in my garage and looked underneath. there was light shining out through multiple locations around the perimeter of the tank. My trunk and/or interior was gonna be Central Command Headquarters for exhaust fumes. By that time the advantage of going to a 22 gallon tank hit home and so I corrected it with the swap. The factory spec is .375" MINIMUM diameter of sealer/rope, about 3/8" thick. I recall reading a post by 22GT recommending four strands together to be a good idea. :thumbsup:
 

·
Registered
Joined
·
2,337 Posts
Then you got lucky, Stan. The first tank I installed was a 16 gallon and I saw a Youtube video that showed using a single strand. Then I read a thread saying that wasn't enough so I put a light in the trunk and closed the lid. Then I turned off the lights in my garage and looked underneath. there was light shining out through multiple locations around the perimeter of the tank. My trunk and/or interior was gonna be Central Command Headquarters for exhaust fumes. By that time the advantage of going to a 22 gallon tank hit home and so I corrected it with the swap. The factory spec is .375" MINIMUM diameter of sealer/rope, about 3/8" thick. I recall reading a post by 22GT recommending four strands together to be a good idea.
So four strands being two stacked on top of another two :: or four laid flat? °°°°
 

·
Premium Member
Joined
·
5,793 Posts
So four strands being two stacked on top of another two :: or four laid flat? °°°°
To be technical about it, the body engineering manual shows it as one thick strand that flattens as you install the attaching screws.
Not only that, but the notes state it should be "...centered OVER the securing holes". :smile2:
 

·
Registered
Joined
·
1,395 Posts
I've used 2 strands and when a bad fuel sender on my tank required that the tank be sent back to Aeromotive, I was able to inspect the crush and found about 75% coverage and no gaps or leaks. When I re-installed the tank, I used the same procedure.
 

·
Registered
Joined
·
6,625 Posts
Discussion Starter #15
Hey guys, this is an easy-peasy thing. Much, of which, is common sense. If the "landing", upon which, your tank sets on, is wavy or, otherwise, uneven(?), then, use common sense. Clean and add, whatever, bedding material is needed to insure the tank is sealed to the frame flange. What's not to do?
If it's really "out of whack", get out your "hammer and dolly" and make it right?
 

·
Registered
Joined
·
2,610 Posts
22 gal tank

I put one in my 64 in 1992 and dozens of others since. You cut about 2" off the filler tube and use a new hose, as the older ones can crack and a new one seals better. Even my 65 K GT FB has a 22 gal tank. I've done over 400,000 miles in the 64, so I have almost a 500 mile range with the big tank and overdrive.
 

Attachments

·
Registered
Joined
·
6,625 Posts
Discussion Starter #17
Thanks PonyDoc, your experience is very helpful.
 
1 - 17 of 17 Posts
Top