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 TM 55-1905-221-14-1
Table 4-1. Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4. Check fuel pump relief valve to' determine if it is properly seated.
a. Test fuel flow as follows:
(1) Disconnect fuel return tube and hold open end of the tube in a suitable receptacle.
(2) Start and run engine at 1200 rpm and measure fuel flow from return tube for one minute. It
should be at least 1/2 gallon (1.89 liters).
(3) Be sure all tube connections between the fuel supply and the pump are tight so that no air will
be drawn into the fuel system. Then, immerse the end of the fuel tube into the fuel in the
container. Air bubbles rising to the surface of the fuel will indicate a leak on the suction side
of the pump. If the flow is inadequate, replace the pump (para 4-54).
b. If flow is adequate, go to Step 5.
Step 5. Check for defective starting motor.
a. Check brushes, replace if worn (para 4-30).
b. If brushes are not worn, replace starting
motor (para 4-30).
2. LACK OF POWER.
Step 1. Check for insufficient fuel.
a. Check fuel level in tank using sounding rod (located in lazarette).
b. If fuel level is low, replenish fuel.
c.
If fuel level is correct, go to Step 2.
4-6
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