70 Gas tank in a 67

[1967project]

So I have heard that a 70's gas tank was 5 gallons larger than a 67. Is it possible to stick a 70's gas tank in a 67 without alot of modification?

 

[1320stang]

You'll need to shorten your filler neck and put a big stick in the tank stub and tweek it a bit backwards.

 

[thehueypilot]

I put a 70 model tank in my 68 with no issues. The filler neck needs adjusted like mentioned above and you need a sending unit for the 70 model tank to get your fuel gage to register "full" correctly.

 

[bnickel]

very easy project. i put a 70 tank in my 69 as well, though there are no mods needed to do that on the 69 just have to use the 70 sending unit. you don't have to worry about re-wiring anything for the swap on any vintage mustang they all just use a one wire sending unit so it's plug and play.

 

[SNAKEPILOT]

Maybe I am too picky about the alignment of the tank and the neck but...I started out putting a 69 tank in my 67 fastback. The alignment was way off. 69 tanks have the opening about an inch and a half further back than the 65-68 and 70 tanks. Luckily the shop had a 69 that was being worked on that needed a tank so I didn't have to eat the tank or the return shipping. We put in the 70 tank and it was close but not quite right. We ended up having a muffler shop bend a pipe and then welded the cap flange on the end. That was after we tried three different year filler necks.
I like how the tank height is even with the trunk sides. It will make carpeting much easier. A standard trunk mat won't fit correctly now.

 

[bnickel]

Maybe I am too picky about the alignment of the tank and the neck but...I started out putting a 69 tank in my 67 fastback. The alignment was way off. 69 tanks have the opening about an inch and a half further back than the 65-68 and 70 tanks. Luckily the shop had a 69 that was being worked on that needed a tank so I didn't have to eat the tank or the return shipping. We put in the 70 tank and it was close but not quite right. We ended up having a muffler shop bend a pipe and then welded the cap flange on the end. That was after we tried three different year filler necks.
I like how the tank height is even with the trunk sides. It will make carpeting much easier. A standard trunk mat won't fit correctly now.

that's why you have to bend the neck on the tank itself, not the filler tube. you put a piece of pipe/tubing in the neck of the tank and pry on it until you get it in the right place. i don't know why the 70 tank would be any different than the 69 tank you had, mien were identical in that respect.

 

[yeloxr7]

that's why you have to bend the neck on the tank itself, not the filler tube. you put a piece of pipe/tubing in the neck of the tank and pry on it until you get it in the right place. i don't know why the 70 tank would be any different than the 69 tank you had, mien were identical in that respect.

The tank in question is the 1970 non-emission tank that holds 22 gallons of fuel, versus the 69-70 emissions tank that holds 20 gallons.

 

[bnickel]

The tank in question is the 1970 non-emission tank that holds 22 gallons of fuel, versus the 69-70 emissions tank that holds 20 gallons.

i've never had an emissions tank, all my cars have been Texas cars. my 69 came with the standard 20 gallon tank and i swapped in a tank from a 70 cougar and later replaced it with a brand new 70 mustang tank, direct bolt in for my car, but for the 67/68 cars the rank would need the neck bent to fit the angle of the filler tube.

 

[SNAKEPILOT]

The neck on the tank appears to be soldered not welded. I would be careful bending it. The filler/tank connection could be a weak link in even a minor accident. A foot of muffler pipe bent by a friendly muffler shop was a cheap (free) way to get a perfect fit.

 

[Jsprint68]

Put a 70 into my 68 coupe.

Pictures are here if they don't come up!

http://www.cardomain.com/ride/2038148/3

I cut an inch off of the filler neck and used a piece of 2-1/2" SCH-40 PVC pipe (cause that’s what I had handy) to tweak the opening in the tank back a little. It does look like it's soldered on.

 

[Jester67]

I have a write up with pics on here some where do a search and it should help.

 

[coolblue65]

Do these bigger tanks fit in the 65-66's as well?

 

[Jester67]

Yes