I flew my airplane this morning and had the engine quit on me twice with successful landings. I have a PT-40 with a OS LA 40 mounted to it. I noticed that the fuel line from the remote needle to the carb has developed bubbles, I have replaced all the fuel lines with new and lengthened the hose slightly from the carb to needle valve, as I suspected the cylinder heating the fuel line creating a little vapor lock. Still does the same thing, I am now suspecting the o-ring on the needle valve letting some air by. Has anyone had this problem and can one purchase an o-ring or is a whole new valve in order. I just installed the remote needle assy new from Tower about 3 months ago. Appreciate any input
-Tom