Replace the entire fuel line, primer bulb, filter etc. Rubber and plastic degrade over time. The volatiles that make it flexible “evaporate” and leave the rest of it brittle and/or crumbling. It may look fine on the outside but a mess inside. Crumbly nuggets of deteriorating gas lines will plug up the line and cause what you are experiencing.
Yep. Also, align so the bulb is vertical instead of horizontal. This helps the flapper valves work as designed and can make a big difference.
