I have a Webster M34DJ-3 fuel pump on a Beckett AFG burner for a warm air furnace. I’m not getting any fuel from the pump to the head. However I have flow coming from the air bleeder when opened. I ran a piece of craft wire down the fuel line and it didn’t clogged. It doesn’t have a solenoid attached to the pump. Any suggestions on how to determine the cause and cure?

Hello everyone, New to the community here, and I'm looking at getting some advice on my furnace. As stated in the title, my ComfortMaker N9MSB is failing to ignite the gas when the temperatures drop down below 32 degrees. I'm in Oklahoma and the house is a 1400 sq ft starter home that was built in 2014. The furnace is up in the attic, and there are vents all around the side of the house that lead up into the attic. Due to these vents, it gets pretty cold up there in the winter. I thought maybe this problem had to do with water freezing in the condensate drain line (would make sense since this problem only happens in cold weather). I got an error of 3 blinks, which is a pressure switch error, but in the manual it says it can be many other things. Upon further inspection, it looks like the main drain line has heat cable/tape wrapped all the way down to the water heater closet where it then drains to the sewer. I have a hard time believing that the water could somehow freeze in that pipe because the heat cable being installed. I did some further inspection by taking both doors off of the furnace, turning the thermostat up a bit higher to initiate the startup of the furnace, and held down the RH wire button. I think the inducer starts up first, and after about a minute or so, the glow starts on the igniter. I noticed that the glow igniter went on and off 4 times before it finally lit the gas on fire. I then released the RH wire button to shut everything off, waited a minute or two, and then held the button down again. This time the igniter did one glow and shut off, and then it started the gas on fire on the second glow. This was all testing while it was warm out, probably around 50 degrees in the attic. What do you guys and gals think this could be? It's weird to me that it only happens in extreme colder weather. I am leaning towards maybe the igniter being old/bad and doesn't function well enough in the cold, or the gas sensor might be dirty with carbon. As soon as the outside temperature rises back up to ~34 degrees or so, everything functions normally or at least well enough to not notice any issues. Hopefully this makes sense enough so that I can get some advice and replace the part that's causing the issue. Thanks for any help you can offer!