Flo Jet runs non stop

[Roz]

I have a LP Flo Jet (Air Logic unit) that runs non stop for just one bay (3) out of five when the bays are totally off. I replaced the Flo jet with a new unit and still have the same issue. I can run the meter box normally without an issue. Wand looks like the LP tire Chemcial is running as normal when meter box is off. I have turned off power to bay 3 without any change. At a loss as to what to try next. These are very simple units so scratching head on what to check next.

 

[Keno]

Junk in the solenoid holding it open? Is the solenoid powered when you have the bay off? ie is it still magnetized when off? probably a wiring issue if it is staying magnetized.

 

[Roz]

Small piece of junk inside the plunger! I should have known. Needed a bright light to see it.