This demonstration guide answers one field question about a cracked bulb that pulls air instead of fuel. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with bulb crack inspection and line-check for air leaks. That reading separates a cracked bulb that pulls air instead of fuel from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the primer bulb and adjacent fuel line as the primary path. If it is in spec, do not replace the primer bulb and adjacent fuel line just to complete a parts list.
Repair the failed system
The usual correction is the primer bulb and adjacent fuel line, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about a cracked bulb that pulls air instead of fuel.
Stop before you make it worse
Do not replacing the whole carburetor for a two-dollar bulb. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the primer bulb and adjacent fuel line is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.