This demonstration guide answers one field question about a gap that leaves a packed layer the impeller cannot feed. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with scraper-to-ground gap on a flat pad. That reading separates a gap that leaves a packed layer the impeller cannot feed from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the scraper bar as the primary path. If it is in spec, do not replace the scraper bar just to complete a parts list.
Repair the failed system
The usual correction is the scraper bar, 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 gap that leaves a packed layer the impeller cannot feed.
Stop before you make it worse
Do not bending the bar to close the gap. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the scraper bar is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.