Hmmm.... I'll be talking with my neighbour about his soon, I'll pass that primer story along.... altho he already commented that he doesn't "hear" gas moving when he hits the primer bulb...... at a minimum, that &#*@! plastic shrouding has to come off, to at least try a whiff of Quik Start (which, I don't like using unless provoked, and only judiciously...). I'm leaning towards the carb needs to be pulled.... at least with the plastic removed, we could rule out mud-wasps etc deciding to set up home in the carb throat....I'm in the same boat with impossible to access carbs on my (2) Ariens blowers. The small single stage is very cranky to start in even moderate (30 deg f) temps. I was in the process of deciding where to just drill a 1/2" hole through the plastic, when I discovered that it starts on the first pull if I press the primer bulb WHILE pulling the start cord. I suspect if I can get at the carb I'll find a partially disconnected or damaged primer hose.
If you are @ high-hours on that blower, and the primer is healthy , valve-adjustment perhaps?
Rgds, D.