DETROIT DIESEL 53
2
SECTION 2
FUELS SYSTEM AND GOVERNORS
CONTENTS
Fuel System ...........................................................................................
Fuel Injector (Needle Valve) ....................................................................
Fuel Injector Tube ...................................................................................
Fuel Pump...............................................................................................
Fuel Pump Drive ....................................................................................
Fuel Strainer and Fuel Filter ....................................................................
2.3
Mechanical Governors ............................................................................
Limiting Speed Mechanical Governor (In-Line Engine) ............................ .
Shop Notes - Trouble Shooting - Specifications - Service Tools...............
The fuel system (Fig. 1) includes the fuel injectors, fuel pipes (inlet and outlet), fuel manifolds (integral with the cylinder
head), fuel pump, fuel strainer, fuel filter and fuel lines.
Fuel is drawn from the supply tank through the fuel strainer and enters the fuel pump at the inlet side. Leaving the pump
under pressure, the fuel is forced through the fuel filter and into the inlet fuel manifold, then through fuel pipes into the
inlet side of each injector.
The fuel manifolds are identified by the words IN (top passage) and OUT (bottom passage) which are cast in several
places in the side of the cylinder head. This aids installation of the fuel lines.
Surplus fuel returns from the outlet side of the injectors to the fuel return manifold and then back to the supply tank.
All engines are equipped with a restrictive fitting in the fuel outlet manifold to maintain the fuel system pressure.
Refer to Section 13.2 for the size fitting required.
March, 1973
SEC. 2
Page 1
