I plumbed in my dual 1" pipes and went to start up my Taco 0014 and it won't prime? I can hear it surging but it won't push the water enough to get it going? I did not put in a back flow preventer above the pump. By putting in the back flow, will this help the pump prime? This is an OWB open system setup. The OWB is 165' from the house and I located the pump inside at the lowest point in the system to help with any possible cavitation.