Thank you for asking your question on JustAnswer.
What is the model number of the furnace?When was the last time the furnace was professionally serviced?What is the age of the furnace?What fuel does the furnace use?What have you tried to correct the problem?Do you have a digital camera that you could use to send pictures of the furnace if needed?
I do not have any info on that system either, but here's some free info. If there is a saftey cutout for excessive system pressure, AND you have high water pressure, AND while bleeding the system yo left the fill on after closing the bleeder screw- you may have introduced enough cold water, at street pressure, that would expand upon heating and trip the saftey. Try leaving the fill valve closed and open a bleeder screw at the highest point to relieve overfilling. Make sure your air bladder has the proper amount of air in it. It's purpose is to relieve cold to hot expansion.-
Just saw your post that you were not bleeding the system, but rather the fuel line.
The system would shut down if you opened the bleeder. It would also shut down if it gets air. With the air removed & the bleeder closed it should fire up