Figure 4-15. Primer Pump
Figure 4-16. Secondary Fuel Filter.
(7) Operate the fuel pump priming lever (see Figure 4-15) until fuel, free of air bubbles, flows from the fuel
return line connection.
(8) Tighten the fuel return line connection (see Figure 4-13).
4-43. FUEL PUMP MAINTENANCE.
a. Testing Fuel Pump.
(1) Disconnect fuel line from discharge port.
(2) Pump priming lever (see Figure 4-15). A strong stream of fuel should discharge from the pump.
If the engine has not stopped in the correct position, the priming lever will not operate correctly.
(3) If the priming lever does not operate correctly, turn the engine over and watch for the fuel discharge.
(4) If fuel still does not discharge well or at all, replace the fuel pump.
(5) Disconnect the inlet fuel line from the fuel pump and attach a vacuum gage to the fuel pump. Turn the
engine over; the pump should pull 8-14 in. of mercury (0.28-0.48 kg/sq cm mercury).
b. Removal (See Figure 4-15).
Plug any disconnected fuel lines or ports to prevent any dirt particles from entering them.
(1) Disconnect fuel lines from inlet ports and discharge port.
(2) Remove nuts (6, Appendix F, Figure 70) and retaining plates (7), and separate fuel pump (3) and
gasket (4) from engine. Discard gasket.
c. Installation (See Figure 4-15).
(1) Set new gasket (4) on mounting studs.
(2) Insert pump (3) into tappet inspection hole and mount fuel pump on mounting studs.