Your
Flojet is dead headed against the FB
soap solenoids. If you have a solenoid that leaks liquid, the
flojet will cycle to maintain pressure against the solenoids. I guess you could have an air solenoid ahead of the
flojet that opens when any bay is in use. Some equipment is set up this way to help protect from the issue your having. It could be bad or not seating as well. You'll need to check how your system is set up. If you don't have an air solenoid ahead of the
flojet, change out the affected FB
soap solenoid or check for debris like Mep suggested and you should be good to go.