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jimmyfred
Explorer
Oct 24, 2016

Question About Propane Pigtail ?

..........I have 2-40# propane tanks , both connected to a transfer switch ! When one tank empties , the indicator goes red and I mechanically switch over too the other tank . So , one tank ran out on Sunday , I switch over to the full tank , but indicator stays on Red . I remove empty tank and move full tank over to the side from where I had just removed the empty tank . Turn on valve and indicator goes back to green .
...........So , either there is a mal function with one side of the transfer switch OR the Pigtail is blocked . To check the pigtail from the mal functioning side , I unscrew it from the transfer switch , and then screw it onto a full tank I have sitting on the ground . I , then very slowly open the tank valve , expecting to see propane hissing out of the open end of the pigtail..........Nothing comes out , at all ! Conclusion , the pigtail is Blocked !
............Question , should there be propane squirting out the end of the open end of the pigtail ..........? Is my conclusion correct ? , thanks , jf

21 Replies

  • If I understand them correctly, a pigtail won't flow if connected to the bottle and the other end unconnected. I believe they need system back pressure to hold an internal valve open? But not 100% sure on that.

    The best test would be to put the suspected bad pigtail on the known good side of the regulator with a known full bottle.

    Then put the known good pigtail and known full bottle on the side of the regulator that didn't work.

    If the suspected bad pigtail flows on the suspected side of the regulator, then probably a regulator problem.

    If the good pigtail flows on the suspected bad side of the regulator, then regulator is probably good.

    Then I would be quite sure it's a bad pigtail.

    On the other hand, they're relatively inexpensive so preventative maintenance might dictate to replace them both. I did just that a couple weeks ago, when I had a pigtail begin to leak at the crimp joint.