Vacu-flush doesn't start pump immediately.

[jack boats]

My Vacu-flush doesn't start pump immediately after I flush. It can take over an hour sometimes before the pump kicks in after a flush. If I flush it again after the pump finally runs and builds pressure, the pump will start immediately as it should, but if there is time between the pump running and the next flush it takes hours for the pump to run again.

Any ideas why this is happening? I considered a possible electrical problem but I'm not sure how to troubleshoot it.

Thanks,
J

 

[sailor420]

I would start with the pressure sensor since it activates the pump.