What checks confirm proper operation of the carburetor or fuel injection system after overhaul?

What checks confirm proper operation of the carburetor or fuel injection system after overhaul?

• A. Visual inspection for leaks only.
• B. Test fuel flow and leaks at idle only.
• C. Inspect for leaks, test fuel flow, verify mixtures at idle and full power, and confirm governor control if applicable.
• D. Confirm only that the throttle linkage moves freely.

Answer: (C)

After overhaul, you must verify the fuel delivery system works across the engine’s operating range. This means checking for leaks anywhere in the system, confirming the fuel flow is adequate and unobstructed, ensuring the air–fuel mixture is correct at idle and again at full power, and, if the engine uses a governor, making sure the governor and throttle linkage control RPM properly. Leaks can hide safety hazards and cause lean-running conditions, so a visual inspection alone isn’t enough. A proper fuel-flow check ensures the pump and lines deliver the needed volume, not just at one speed. Verifying mixtures at idle ensures smooth idle and prevents stalling, while checking at full power confirms the engine can reach and maintain rated power without running too lean or too rich. If a governor is present, confirming its control keeps speed in the intended range under varying loads. The other options miss essential parts: they cover only leaks, or only idle flow, or only throttle movement, and omit the full-range mixture checks and governor verification.

After overhaul, you must verify the fuel delivery system works across the engine’s operating range. This means checking for leaks anywhere in the system, confirming the fuel flow is adequate and unobstructed, ensuring the air–fuel mixture is correct at idle and again at full power, and, if the engine uses a governor, making sure the governor and throttle linkage control RPM properly. Leaks can hide safety hazards and cause lean-running conditions, so a visual inspection alone isn’t enough. A proper fuel-flow check ensures the pump and lines deliver the needed volume, not just at one speed. Verifying mixtures at idle ensures smooth idle and prevents stalling, while checking at full power confirms the engine can reach and maintain rated power without running too lean or too rich. If a governor is present, confirming its control keeps speed in the intended range under varying loads. The other options miss essential parts: they cover only leaks, or only idle flow, or only throttle movement, and omit the full-range mixture checks and governor verification.