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TM 55-1905-219-14-8
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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