A Series Diesel Engine Fuel System 70
Air In the Fuel System
A replacement of supply lines, fuel filters, injection
pump, high pressure lines and injectors will let air
enter the fuel system. Follow the specified procedure
to bleed the air from the system.
Since the lift pump provides a positive pressure
through the fuel filter and supply line to the injection
pump, loose connections or defective seals will show
as a fuel leak.
The most usual place for air to enter the fuel system
is between the inlet of the lift pump and the suction
tube in the tank. Fuel tanks that have the outlet fitting
at the top will have a suction tube that extends down
in the tank.
Cracks or pin holes in the weld that joins the tube to
the fitting can let air enter the fuel system.
Air in the system will make the engine: hart to start,
run rough, misfire, produce low power, and can cause
excessive smoke and a fuel knock.
To Next Page
Loading...
