We have a fairly new Hyster electric forklift that came from the dealer with a single point battery fill and gravity feed tank.

Usually when we connect the water it will fill then when the flow indicators stops spinning we disconnect it and off we go. Recently, the water seems to just keep filling until it starts to flow out of the top of the first battery that the filling system is connected to.

Any idea why it wouldn't stop on it's own anymore?

Thank for any help or info!
Scott