TM 5-3810-207-20/TO 36C23-3-37-12 Section V.  CRANE ENGINE FUEL SYSTEM 105.  General The   fuel   system   consists   of   a   50-gallon   fuel tank,  fuel  pump,  carburetor,  air  cleaner,  primer  pump, lines,   and   fittings.      The   crane   engine   fuel   tank   is mounted  underneath  the  machinery  deck,  on  the  left side  of  the  crane  cab.    The  tank  is  filled  through  the machinery  deck  at  the  left-front,  outside  corner  of  the cab.  A fuel line with a shutoff cock connects the tank to a diaphragm-type fuel pump, mounted on the right-rear side  of  the  engine  block.    A  fuel  line  connects  to  an updraft-type carburetor, mounted on the right side of the engine.  An oil-bath type air cleaner is mounted on the bracket at the rear of the engine with a connecting hose from  the  air  cleaner  to  the  bottom  of  the  carburetor. During  operation,  clean  air  passes  from  the  air  cleaner to  the  carburetor.    At  the  carburetor  the  air  picks  up  a spray of gasoline. and the gasoline-air mixture is drawn into the cylinders where it is ignited by the spark plugs. A  line  from  the  fuel  tank  connects  the  primer  pump, which is mounted on the cab behind the operator's seat, with a line leading directly to the engine.  The primer is for cold-weather starting. 106.  Carburetor a. Removal.  Remove the carburetor as instructed on figure 40. b. Cleaning and Inspection. (1) Clean   the   carburetor   with   an   approved cleaning solvent. (2) Inspect  the  carburetor  for  wear,  improper operation,   and   other   damage.   Replace defective carburetor. c. Installation.    Install  the  carburetor  as  illustrated on figure 40. d. Adjust.  Adjust carburetor (TM 5-3810-207-10). 107.  Air Cleaner and Heat Deflector a. Removal. (1) Remove the air cleaner and heat deflector as instructed on figure 41. (2) Drain  the  oil  from  the  air  cleaner  (TM  5- 3810-207-10). b. Cleaning, Inspection, and Repair. (1) Clean  all  parts  of  the  air  cleaner  with  an approved cleaning solvent. (2) Inspect  all  parts  for  bends,  cracks,  and other   damage.      Repair   or   replace   all defective parts. c. Installation. (1) Install  the  air  cleaner  and  heat  deflector as illustrated on figure 41. (2) Service  the  air  cleaner  (TM  5-3810  207- 10). 108.  Fuel Pump a. Remove  the  fuel  pump  as  instructed  on  figure 42. b. Cleaning and Inspection. (1) Clean   the   fuel   pump   with   an   approved cleaning solvent. (2) Inspect  the  fuel  pump  for  breaks,  proper operation,   and   other   damage.   Replace defective fuel pump. c. Installation.    Install  the  fuel  pump  as  illustrated on figure 42. d. Test. (1) Remove the pump-to-carburetor fuel line. (2) Operate primer handle until fuel flows. Note If    fuel    does    not    flow,    pump    is defective or tank-to-pump fuel line is clogged. Replace defective pump. 109.  Priming Pump, Lines, and Fittings a. Removal.      Remove   the   priming   pump,   lines, and fittings as instructed on figure 43. b. Cleaning and Inspection. (1) Clean the priming pump, lines, and fittings with an approved cleaning solvent. (2) Inspect    the    priming    pump,    lines,    and fittings    for    breaks,    cracks,    and    other damage.          Replace     defective     priming pump, lines, and fittings. c. Installation.  Install the priming pump, lines, and fittings as illustrated on figure 43. d. Test. (1) Remove the primer fuel line at the intake manifold. 69