Plastic Gas Tank

The plastic tank (MTS ) that I got along with my 65 looks to have a stripped groove where the gas cap prongs thread into to tighten the cap.
Anyone else ran into this or have a solution to keep the cap tight?
Plastic tanks kinda suck...

 

There are threaded inserts available for plastic. Here is Mcmasters, but they are available all over the web. Just make sure you have enough wall thickness.

https://www.mcmaster.com/products/inserts-for-plastics/threaded-inserts-2~/

 

I have a MTS plastic tank in my CJ5 which I installed nearly two years ago. The gas cap has always been a little difficult to lock, and the notches are getting a little chewed up, so I'll probably have a similar issue at some point. I have been thinking that I might be able to fit the steel fitting from an old gas tank into the plastic filler pipe.

 

Possibly you can do some plastic welding with a solder gun and some zipties?

 

Its always been recommended to use an original cap rather than an aftermarket one. I think I still had to do a little shaping to clean up the threads and get it working right when I did my tanks but I havnt had any change since fitting them 15 years ago.

 

I misunderstood the OP, I thought this was about the sending unit hole.

 

I just got a new MTS tank a short while back and noticed the same problem. I can get the cap on but have to be very gentle. May be worth looking at a fix before I install it.