Jon,
I've noticed a problem with the toilet over the past few months. With the water pump on, the toilet may flush for 5 seconds or it may run for a minute or longer. If it ran longer than 10 seconds, I'd turn off the pump and wait a few minutes before energizing the pump again. It just happened occasionally and I put off looking at it. On city water, it depends on the pressure as to whether the flush is normal or just a gravity drain of the water. On city water it does not continue to run like with the pump on. Now with the pump on, it will run continuously until the pump is turned off and on city water it may flush normally or just drain by gravity but no continuous flush like on the pump.