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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-2A. Portable Fire Pump (PE-250) - Running Troubles (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Spark plug cable loose.
Tighten spark plug cable connection.
Step 4. Faulty ignition system.
Troubleshoot ignition system, refer to paragraph (4-7.7A.)
3. Poor acceleration.
Step 1. Choke closed.
Open choke.
Step 2. Carburetor improperly adjusted.
Adjust carburetor, refer to paragraph 4-7.7A.
Step 3. Dirt in carburetor inlet needle valve.
Replace carburetor, refer to paragraph 4-7.7A.
Step 4. Exhaust port heavily coated with carbon.
Remove carbon, refer to paragraph 4-7.10A.
4. No acceleration.
Step 1. Carburetor idle mixture to lean.
Adjust carburetor, refer to paragraph 4-7.7A.
Step 2. Carburetor diaphragm cover plate loose.
Tighten screws securing cover plate.
Step 3. Carburetor diaphragm gasket leaking.
Replace carburetor, refer to paragraph 4-7.7A.
4-22
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