Sorry for the stupid question. I replaced the mechanical fuel pump on my car. I then ran a steel fuel line from the pump to the carb. The line seems to seal properly (I got pre-flared lines, as I did a real hack job trying to flare my own). BUT - it looks like I have a leak between the rebuilt fuel pump and the elbow fitting I put in it. I thought I was not supposed to use a thread sealer, as it is a simple pipe thread. I'm guessing I'm wrong. What should I use that is fuel resistant? Between the leaking fuel fitting at the pump and the jolts from the wire to the coil I crimped wrong - I've got some fixing to do. Or at least need to keep the fire extinguisher handy.