FITTING 5K9245 - 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.
The fuel system should be primed after a unit injector is changed or when the fuel system is dry.Note: The fuel system does not typically require priming when the primary fuel filters or secondary fuel filters are changed or when an Electronic Control Module (ECM) is replaced. When the engine is started under these circumstances, the engine may momentarily run rough until the air is purged from the system.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over any disconnected fuel system components.
The fuel system will be primed in the following manner:Electronic Modular Control Panel (EMCP)
Illustration 1 g03671791
(5) Electronic Modular Control Panel (EMCP)
(6) Electronic Control Module (ECM)
(7) Fuel priming relay
(8) Service port
(9) Communication adapter
(10) Cat ET service tool The EMCP sends requests for priming via FD92 (SPN 4082).The EMCP receives the status of the pump on FE6A (SPN 4083).
Go to the "Control" menu on the EMCP.
Go to "Engine Fuel Priming".
Press the "Right Arrow" key to turn the priming "ON". Press the "Left Arrow" key to turn the priming "OFF". Each time the "Right Arrow" is pushed, the pump will run for 2 minutes. The EMCP will show the status "Priming", or "OFF".There is also a switch at the priming pump. Each time the switch is toggled, the pump will prime for 2 minutes.Electronic Control Module (ECM)
Priming
The ECM activates the relay if all of the following are true:
A request is sent from the EMCP (5) on FD92 (SPN 4082)
Engine speed is 0 rpm
Emergency stop is not activeThe ECM (2) deactivates the relay (7) if any of the following are true:
The EMCP (5) cancels the priming request
Fuel priming time has elapsed
Emergency stop is active
Engine speed is greater than 0 rpmAssist
The ECM (6) activates the relay (7) when all of the following are true:
Engine speed is greater than 0 rpm
Engine speed is below the fuel pump assist speed threshold
Engine is in cranking or starting state