If it isn't your fuel line, you have a bad housing as stated. I had nothing but bad luck with remote needles. I will never buy another. I bought the 55AX and it has the needle back in the carb where it belongs. So far, so good, I like it. OS ate a few of my remote needle FX engines. I have a few .46 FX engines that run fine, but have had quite a few bad ones.

If you can't get it, try a K&B remote needle and see if it is the housing.

Good luck'