What operational difficulties are associated with fuel incompatibility?

Correct Answer: Option B — Frequent clogging of final fuel filters and sticking/scuffing of fuel pump plungers and nozzles.

Incompatible fuel blends cause asphaltene precipitation, which rapidly chokes final fuel filters and causes catastrophic scuffing, sticking, and abrasive wear on close-tolerance high-pressure fuel pump plungers and injector needle valves.