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Vacuum Test
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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FOAM TANK - TM-5-4210-220-34_136
TM 5-4210-220-34 2-13. FIRE PUMP - Continued 2-13.14 Fire Pump Tests - Continued c. Pressure Test NOTE This test should only be carried out if the pump will not hold vacuum with blanking tools (6,  7 Appendix D) in place.  Perform following test to trace possible leaks that are responsible for the vacuum leaks (1)     Apply 50 to 100 psi water pressure to the volute body through suction blanking tool (7, Appendix D). (2)     Check for water leaks around fire pump.  Refer to appropriate repair section to rectify water leak. (3)     If no leaks are found, the vacuum leak must be in line from the water ring primer to the priming valve.  Check for the following: Priming valve sealing washer damaged; see para.  2-13.10.  Water ring primer non-return valve damaged; see para.  2-13.9.  Rubber hose between priming valve and non return valve.  Replace hose as required. 2-134

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