[wrogers55]

I have a MassFlo on mine as well. The pumps might be different, but on mine, if the pump isn't running, it will not start or run at all. The pump circuit has a return line and you can hear it build up pressure and then change sounds, but it is still running. If I let it build up pressure then shut off the pump, hit the starter, it still will not start. Mine needs the pump running and pressure on the gauge all the time. Yours might be different, but hope this helps.