Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI systems use bottom fuel-feeding injectors. Who is correct?

Question

Quizplus · Accepted Answer

TBI (Throttle Body Injection) systems typically use injectors mounted in the throttle body that spray fuel above the throttle plates, not necessarily "top feeding" in the context implied. PFI (Port Fuel Injection) systems have injectors that spray fuel directly into the intake port of each cylinder, not necessarily "bottom feeding." The descriptions provided don't accurately represent how these systems feed fuel, leading to the conclusion that neither technician is correct.

Technician a Says TBI Systems Use Top Fuel-Feeding Injectors