GAUGE (Air Pressure) 8D1264 - Caterpillar

If air enters the fuel system, the air must be purged before the engine can be started. Air can enter the fuel system when the following events occur:
The fuel tank is empty or the tank has been partially drained during normal operation.
The low pressure fuel lines are disconnected.
A leak exists in the low pressure fuel system during engine operation.
The fuel filter or the fuel pump is replaced.
The high pressure fuel lines are disconnected.Use the following procedure in order to remove air from the fuel system:
Turn the ignition key to the RUN position for three minutes in order to energize the electric fuel transfer pump. Do not start the engine.
Turn the ignition key to the OFF position.
Illustration 1 g01358092
(1) Connections for the high pressure fuel lines
Loosen the connections for the high pressure fuel lines (1) .
Operate the electric starting motor until fuel that is free of air comes from the connections.
Tighten the connections for the high pressure fuel lines. Refer to Specifications, "Fuel Injection lines" for the correct torque.
Start the engine and check for leaks.