Originally Posted by grizz1

If you can't find any O rings just use a piece of silicone fuel line.
Cut a piece just a fraction wider than the groove in the needle. Use a pair of long nosed pliers to hold the tubing open while you fit it over the end of the needle. Tuck it into the groove as good as you can. Now screw the needle in until all the tubing is out of site. This will shave a ring of excess tubing off from around the outside. You now have a perfect needle O ring which is fuel resistant and a perfect fit. This is all I use on my needles now. The tubing won't dry out and leak like the factory O rings. I have run this in my engines for over a year now with no problems at all.