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Fuel Priming Pump
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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INSTALLATION - TM-5-4210-220-12_520
TM 5-4210-220-12 4-23.  FUEL SYSTEM AND AIR INTAKE - Continued (4) Tag   and   disconnect   grounding   wire   (2) from   priming   pump   and   fuel   tank   level sender. (5) Tag and disconnect positive wire (3) from priming pump. (6) Remove   main   engine   fuel   delivery   line (4). (7) Using  a  flat  screwdriver,  remove  the  10 screws     and     washers     clamping     pump upper flange to fuel tank. (8) Withdraw  pump  from  fuel  tank,  allowing fuel to drain out of pump into tank. (9) While holding pump over suitable receptacle,   remove   hose   clip   (7)   from pump  discharge.    Pull  hose  (6)  off  nipple and    drain    fuel    from    hose    and    pump. INSPECTION (1) Remove gasket (5) from pump flange and discard. (2) Disconnect electrical lead (10) from underneath top plate. (3) Unclamp the clamp ring (9) holding pump to hanger. (4) Connect 0 - 20 psi (0 - 150 kPa) gage to pump outlet. (5) Immerse pump (8) in an open container of diesel fuel for at least 5 minutes. (6) Connect pump to a 12 volt battery via an ammeter,  voltmeter,  fuse  and  switch  as shown. (7) Start    pump    and    check    the    following readings. (a) Pump  pressure  exceeds  7  psi  (48 kPa) (b) Battery voltage exceeds 13.2V (c) Pump current less than 5.0A (8) If pump is not better than specification, leave it soaking for a further 10 minutes and try again.  If pump will   not   rotate   at   all   check   electrical   connections,   see   REPAIR   following.      If   it   still   will   not   meet specification the pump is faulty and must be replaced. 4-395

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