Agree with Carl. Teflon tape is not recommended. Definitely the white and the yellow is not. It will shred and possibly turn to goo. The best thing is nothing unless it is made for gasoline.
If there is a leak and the white or the yellow seals it, it means there was a gap, which means the tape filled the gap, which means the gas will come in contact with it, which means there is a reverse leak path back into the line.
It may work, but the risk for me, doesn't work.
