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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-2. Portable Fire Pump (P-250) Carburetion Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6. Faulty diaphragm.
Refer to paragraph 4-7.4.
Step 7. Faulty acting check discs in pump mechanism.
Refer to paragraph 4-7.4.
Step 8. Clogged screen.
Refer to paragraph 4-7.4.
Step 9. Water in fuel tank.
Refer to paragraph 4-7.4.
3. Carburetor.
Step 1. Improperly adjusted high and slow speed needles.
Refer to paragraph 4-7.2.
Step 2. Carburetor loosely mounted.
Refer to paragraph 4-7.2.
Step 3. Faulty fuel line connection.
Refer to paragraph 4-7.2.
Step 4. Shutter (butterfly) improperly adjusted.
Refer to paragraph 4-7.2.
Step 5. Faulty float action.
Refer to paragraph 4-7.2.
Step 6. Faulty float valve action.
Refer to paragraph 4-7.2.
Step 7. Damaged needle and float valve seats.
Refer to paragraph 4-7.2.
4-13
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