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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 4. Intake manifold loose or leaking.
Replace gasket, refer to paragraph 4-7.10A.
Step 5. Carburetor leaking or malfunctioning.
Replace carburetor, refer to paragraph 4-7.7A.
5. Engine backfires through carburetor.
Step 1. Insufficient fuel.
Check fuel tank and fuel lines.
Step 2. Wrong spark plug.
Check spark plug and/or replace.
Step 3. Air leakage from faulty gasket or oil seals.
Check gaskets and seals and replace as necessary.
6. Pings under heavy load, full throttle.
Step 1. Ignition timing too early.
Check ignition timing, refer to paragraph 4-7.10A.
Step 2. Wrong spark plug.
Check spark plug and/or replace.
Step 3. Carburetor main fuel.
Adjust carburetor, refer to paragraph 4-7.7A.
Step 4. Adjustment too lean.
Adjust carburetor, refer to paragraph 4-7.7A.
4-23
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