BUSHING 3914387 - Caterpillar

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Illustration 1 g00107947
(1) Fuel priming pump
(2) Fuel filter plug
(3) Connector cap
(4) Fuel outlet line on the ECM
(5) Fuel filter
Illustration 2 g00110065
(6) Air purge plug for the fuel system
(7) Fuel return
(8) Fuel inlet Priming the fuel system fills the dry fuel filters. Priming the fuel system also removes air from the fuel system. This procedure is used primarily when the engine runs out of fuel. This procedure can also be used when a unit injector is replaced or the Electronic Control Module (ECM) is replaced.Note: During any periodic service of the fuel filter, DO NOT remove fuel filter plug (2) in the fuel filter base in order to release air from the fuel system. Periodic removal of this fuel filter plug (2) will result in the increased wear on the threads in the fuel filter base. This can lead to fuel leakage. However, the fuel filter plug (2) in the fuel filter base can be used to purge air from the fuel system if the engine runs out of fuel.
Loosen connector cap (3).
Open fuel priming pump (1) and operate the fuel priming pump until fuel appears at connector cap (3). Tighten connector cap (3).
Loosen fuel return (7) for two full turns. Operate fuel priming pump (1) until fuel appears at fuel return (7). Tighten the fuel return (7).
Continue to operate fuel priming pump (1) until a strong pressure is felt on the fuel priming pump and until the check valve clicks. This procedure may require considerable priming. Lock fuel priming pump (1).
Crank the engine after pressurizing the fuel system.
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.
If the engine does not start, open fuel priming pump (1) and repeat Steps 1 through 5 in order to start the engine.
When the ECM is replaced, loosen the fuel outlet line on the ECM (4) in order to purge the air from the fuel system. Operate fuel priming pump (1) until fuel appears at the fuel outlet line on the ECM (4). Tighten the fuel outlet line on the ECM. Perform Steps 3 through 5.
When a unit injector is replaced, perform Steps 3 through 5.