DETROIT DIESEL 53
2
SECTION 2
FUEL SYSTEM AND GOVERNORS
CONTENTS
Fuel System .........................................................................................................
Fuel Injector (Needle Valve)................................................................................
Fuel Injector Tube ................................................................................................
Fuel Pump ...........................................................................................................
Fuel Strainer and Fuel Filter.................................................................................
2.3
Mechanical Governors .........................................................................................
2.7
Variable Speed Mechanical Governor (6V Engine)...............................................
2.7.2.1
Shop Notes - Trouble Shooting - Specifications - Service Tools ...........................
2.0
FUEL SYSTEM
Fuel is drawn from the supply tank through the fuel
The fuel system illustrated in Fig 1. includes the
strainer and enters the fuel pump at the inlet side.
following: injectors, fuel pipes (inlet and outlet), fuel
Leaving the pump under pressure, the fuel is forced
manifolds (integral with the cylinder head), fuel pump,
through the fuel filter and into the upper fuel manifold,
fuel strainer, fuel filter and fuel lines.
then through fuel pipes into the inlet side of the
injectors. The fuel manifolds are identified by the words
A restricted fitting is located in the cylinder head fuel
IN (top passage) and OUT (bottom passage) and are
return manifold outlet to maintain pressure in the fuel
cast in several places in the side of the head. This aids
system. On the V-type engine this restricted fitting is
in the installation of the fuel manifold inlet and outlet
located at the rear of the left bank cylinder head.
lines. Surplus fuel returns from the outlet side of the
injectors through outlet fuel pipes into the return
manifold and then back to the fuel tank.
1972 General Motors Corp.
July, 1972
SEC. 2 Page 1
