ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 3-45 (5) Cover all openings to prevent entry of foreign material. c.   Inspection. (1) Remove fuel supply pump, refer to step b. (2) Inspect fuel supply pump (3, Figure 3-16) lever face (9) for wear.  Replace fuel supply pump if lever face is worn flat or concave. d.   Test, bench. (1) Remove fuel supply pump, refer to step b. (2) Perform vacuum/pressure test as follows: (a) Install vacuum/pressure gage to fuel inlet (7, Figure 3-16). (b) Move primer lever (6) all the way downward.  Release lever and at the same time observe gage.    1 Gauge needle should read the same value each time primer lever is moved all the way downward and released.  Gauge needle should then slowly return to "0" each time.  Repeat several times. 2 If gauge needle reads different values on different attempts, does not move at all, or rapidly returns to "0", fuel supply pump is defective and must be replaced. (c) Remove vacuum/pressure gage from fuel inlet (7) and install vacuum/pressure gage on fuel outlet (8). (d) Move primer lever (6) all the way upward.  Release lever and at the same time observe gage.    1 Gauge needle should initially read 4-6 psi (28-41 kPa), then quickly return to "0".  This indicates that the outlet valve and diaphragm are in good condition, supply pump is operating properly and should be reinstalled on engine. 2 If gauge needle does initially read same value as indicated above and then returns immediately back to "0", fuel supply pump is defective and must be replaced. (e) Remove vacuum/pressure gauge from fuel outlet (8). (3) Perform leakage test as follows: (a) Install a plug on fuel outlet (8, Figure 3-16). (b)   Install regulated pressure air line on fuel inlet (7, Figure 3-15) and apply 20 psi (140 kPa) pressure.