TUBE AS 3268054 - Caterpillar

Ensure that the correct fuel priming procedure is carried out. Failure to carry out the correct procedure may result in damage to the fuel injection pump and other fuel system components.
To purge air from the fuel system, there is a new alternative fuel priming procedure. The following procedure should be carried out before the engine is started.
Turn the keyswitch to the RUN position. Leave the keyswitch in the RUN position for 3 minutes.
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Crank the engine with the throttle lever in the CLOSED position until the engine starts.Note: If necessary, loosen the union nuts on the fuel injection lines at the connection with the fuel injector until fuel is evident. Stop cranking the engine. Tighten the union nuts to a torque of 30 N m (22 lb ft).
Once the engine has started, operate the engine at low idle for 1 minute.
Turn the keyswitch to the OFF position to stop the engine. Wait for 30 seconds.
Start the engine. The fuel system will now be primed and ready for operation.This priming procedure is an alternative procedure to the existing procedure documented in the latest release of the Operation and Maintenance Manual. Use the most suitable priming procedure for the application to purge air from the fuel system.