Ever since I got my car, every now and then it would develop a little problem. While driving along the car would just start to lurch back and forth violently like a beginner stick driver stalling out the car, except it would happen to me while cruising along at highway speeds. It was always a mystery until recently, and I've finally figured it out! What has been happening is, the tube that screws into the top of the carb inside of the float chamber(this is the "sheath" that the needle operates in, and has the only entry into the float chamber for fuel) has been loosening itself over time and basically making so that while I'm driving along, all of a sudden the float chamber completely runs out of gas and it can't fill up due to the fact that the tube has loosened itself and the needle is now permanently seated. So i would have to pull over, take off the top of the carb, pull of the float and needle, screw in the tube, and then drive away fine and dandy. Clever me wrapped the threads in teflon tape and thought to myself voila! problem fixed

, but it happened again twice yesterday and i've found out that gasoline loves to dissolve teflon tape
So here's the question, what can i use to lock the threads of that little bastard so it stops wiggling itself free? Of course thread lock comes to mind immediately. BUT would that be safe to have in there? Or would it even hold up to gasoline? What else can i use to lock it?
Thanks as always