In Reply to: Shutoff valve posted by Frank (WNY) on May 17, 2020 at 09:51:38:
I haven't had issues with Just8N's or Carpenter parts but did have issues with a Sediment Bulb and two Valve Stems I got from that popular "tractor supply" place in town next to McDonalds. The Bulb had mucked up NPT threads on it and it did a number on the gas tank, but I was able to repair and used a lot of Gasoila doing it. The valve stems used vinyl for the internal seal -supposed to be oil and gas resistant rubber, and leaked. I'd determine if the leaking is coming from the valve stem or from the brass elbow inlet on the carb. You probably already know this, but all the threads on the fuel line are a special thread size, made for brake, fuel, and oil lines only at 7/16-24 UNS. If the Bulb fuel valve stem inlet and/or the fuel line outlet, or the brass elbow gets cross threaded or chased with the wrong size tap, you'll never fix that and leaking will be prevalent. So, to test the valve, pull fuel line off the brass elbow and slide off to a container. Open knob 2 Full Turns. Observe stem to see if leaking is from there. YES? Ensure the stem is seated correctly. Always hand start threads and screw in as far as it will go before tightening with a 7/16 flare nut wrench -never use pliers, channel locks, or a crescent wrench -those will round off the hex nut. Open and close the valve a few times and feel tightness of unit before final sequence. If not leaking there, then it has to be in the brass elbow. The elbow has an NPT male thread on it and the carb has a female NPT thread. Often fellas don't know this and try to chase it with a standard tap and end up crossthreading it. Likewise, the female port accepts the 7/16-24 fuel line thread and can be boogered up as well. Once leak is stopped, put a dab of thread locking goop on the small 8-32 screw that secures the Valve Stem/Bulb knob on with. This ensures the knob won't fall off in use. You don't realize it fell off until you get back to the barn and go to kill the fuel. Always kill/shut off fuel valve when not in use. See if this helps -post back.
APN-9194 SEDIMENT BULB FUEL VALVE STEM:
OEM SEDIMENT BULB ASSEMBLY & VALVE STEM:
OPEN VALVE STEM 2 FULL TURNS FOR MAIN OPEN POSITION, FULL FOR RESERVE POSITION, OFF POSTION WHEN NOT IN USE: