I replaced a seized oil pump today on an older oil furnace with same rpm, rotation, and gpm. Simple right? I called for heat and started the bleed and as I got a solid fuel column, system cut out on safety. Hit the reset button to finish the bleed and now it won't bleed, nothing comes out of my bleed port. When I installed the new pump, I replaced the coupling and verified the motor was turning the pump, it was. This pump is a single stage 2 pipe system (supply/return). This suntec pump requires a small plug (5/32) be installed in the return port before hooking up the return line, which I did. I also verified no obstruction from tank to filter by syphoning, yummy. The filter is also brand new and the cartridge clean. I tried several times to bleed with no sucess. Pump press. was zero with no fuel of course. What gives?