Topic: ski-doo plastic gas tank

[2wheels]

any help please

I have an old ski-doo with a plastic gas tank.  In the process of cleaning it out I took the fuel level sender unit out.  But broke one of the 5 screws off.
These screws are into a brass thread that is molded into the tank.
I can get a vise-grip on the screw but it's not turning.
I have just started trying the acetone and ATF mix and am hoping that helps.

I was considering heating up my vise-grip with a tourch,  then clamping onto the screw to heat it up a bit.  any opinions on this.

Any other ideas?

Obviously I'm keep flames away from the tank.   For now   

[faux fiddy]

Maybe try a soldering gun to heat it up?

[old76cr]

Maybe take a dremel tool to cut a slot into the screw stub and them an impact driver to get it out. I used this method on frozen case screws.

[2wheels]

Thanks guys
because its plastic it was way too flexible to use a impact driver.  You can be sure I wanted to.

Also I gave heat a lot of thought, the big ass solder iron was what I had in mind.  Again plastic is so soft I decided against it.

I tried quick freeze, it did not help at all.
Eventually it decided to drill it out.  It actually went really well.  By luck or probably just the odds, it went right down the middle.
I went up to the tap drill size for M5, then ran a tap down the hole and I was done.  The new screw is a little loose but it should be Ok.

The fuel sending unit is back in.  I used Permatex #2 which I have read is good for gasoline,  it's not silicone.
I also bought Permatex #3 whick is the Aviation stuff but later read it is only good for between 2 solid surfaces.
We will see.

Not a great picture,  I have sandwitch wrap covering the hole to keep the gasoline in and metal chips out.

[Danno]

the insert can be taken out of a poly tank and then the hole either welded shut with a patch or after the insert is fixed it can be reinserted cold with a little epoxy to hold it it can be done with heat too but it requires that you have extra virgin polyetheline to melt in with it the insert in this process is only warmed not too hot or the plastic will shrink away from the insert

[2wheels]

Thanks Danno
I was looking at that.  I even pulled and pushed the bulb inside the tank (that holds the screw thread) thinking maybe they just sit inside there with an O ring to seal them.
Good to know replacing them is do-able,  it may require more skill than I have to work on HDPE which is what I think these tanks are made of.