EETC Carburetor Service and Repair 3

Question 1

What is the most common cause of a carburetor flooding condition?

Accepted Answer

A damaged or stuck float or needle valve not closing properly

Answer

A stuck float or worn needle valve seat fails to shut off fuel flow when the bowl is full, allowing fuel to overflow into the engine.

Question 2

During carburetor overhaul, which cleaning method should NOT be used on rubber or plastic components?

Accepted Answer

Soaking in a strong chemical carburetor dip solution

Answer

Harsh carburetor dip chemicals are designed for metal parts and will dissolve, swell, or harden rubber seals and plastic components.

Question 3

Ethanol-blended fuel left in a carburetor for an extended period commonly causes what problem?

Accepted Answer

Corrosion of metal passages and deterioration of rubber and plastic components

Answer

Ethanol absorbs moisture, accelerates corrosion in metal passages, and chemically degrades rubber diaphragms, O-rings, and plastic parts.

Question 4

A completely clogged idle circuit jet will most likely produce what symptom?

Accepted Answer

Engine idles but stumbles or dies when the throttle is opened slowly

Answer

The idle circuit supplies fuel through the throttle transition zone; a blockage causes a lean stumble or stall as throttle is opened before the main circuit takes over.

Question 5

When inspecting a carburetor body, which condition requires replacement of the carburetor rather than repair?

Accepted Answer

Excessive throttle shaft bore wear causing an air leak

Answer

Worn throttle shaft bores allow unmetered air to bypass all circuits, creating a lean condition that mixture screws cannot compensate for.

EETC - Equipment & Engine Training Council Practice Test

EETC - Equipment & Engine Training Council Practice Test

EETC Carburetor Service and Repair 3