I have read through a lot of information on how to bleed a furnace that had run out of oil. But I am still not having any luck. When I open the bleeder valve, I just get a very slow drip of oil. I am unable to get the furnace electrically started. I have tried tapping the reset button, holding the reset button a long time, thermostat on and off, burner emergency switch on and off. What is it supposed to sound like when it's on but not primed? What else can I try to get it running again? As far as I know, there is nothing wrong with the furnace--it just ran out of oil.