Excessive Fuel Consumption - TM-10-3930-607-150086

FUEL

TROUBLESHOOTING

CAUSE

REMEDY

4. Dirty or improper governor adjustment

4. Clean and calibrate governor. Adjust governed engine

RPM.

Flat Spot In Acceleration Or Poor Acceleration

1. Defective carburetor

1. Refer to CARBURETOR - Troubleshooting Guide.

Excessive Fuel Consumption

1. Restricted exhaust system

1. Check heat control valve. Loosen if stuck.

Replace restricted muffler and exhaust pipes.

2. Clogged air cleaner

2. Clean. Service more often.

3. Low grade of fuel

3. Change to a better grade of fuel.

4. Rich or lean air-fuel mixture, defective

4. Refer to CARBURETOR - Troubleshooting

carburetor or fuel pump

Guide, and FUEL PUMP - Troubleshooting Guide.

5. Carburetor choke valve partially closed

5. Push choke button in. Check and adjust choke valve so

that it opens and closes completely.

Erratic Idle Speeds

1. Low grade of fuel

1. Change to a better grade of fuel.

2. Rich or lean air-fuel mixture, defective

2. Refer to CARBURETOR - Troubleshooting Guide, and

carburetor or fuel pump

FUEL PUMP - Troubleshooting Guide.

3. Looseness in carburetor throttle valve

3. Remove slack. Replace parts as necessary.

control mechanism

Check carburetor throttle shaft. The shaft should not be

loose in the body.

4. Fuel not vaporizing before entering corn-

4. Check and free-up stuck heat control valve.

bustion chamber

5. Vacuum leak between the carburetor mount-

5. Replace gaskets as necessary. Tighten screws securely.

ing flange and intake ports in the block

6. Vacuum hose loose or deteriorated

6. Tighten hose clamps. Replace hose if necessary.

B-49