HOSE AS 4720595 - Caterpillar

3. Disconnect two wiring connectors (1).
The fuel in the engine electronic control module and in the hose assemblies connected to the module may be under high pressure. When the hose assemblies connected to the module are disconnected, the pressure will be released. Fuel under high pressure can penetrate the body causing personal injury. To release the pressure, slowly loosen the hose assemblies from the module.
4. Disconnect two fuel lines (2). Cap and plug all openings immediately.5. Remove four bolts (5) and the washers, eight rubber grommets (6), and four spacers (7). Remove engine electronic control module (4). The following steps are for the installation of the original engine electronic control module that was removed in steps 1 through 5. If a new engine electronic control module is to be installed, refer to the topic "Replacing The Electronic Control Module with a New ECM" in the 3408E & 3412E Engine Troubleshooting Manual module, SENR1060.6. Install engine electronic control module (4) with four spacers (7), eight rubber grommets (6), four bolts (5) and the washers.7. Connect two wiring connectors (1) with two bolts (3).8. Connect two fuel lines (2).9. Open the fuel main supply valve. Prime the fuel system. Refer to the Operation & Maintenance Manual for the correct procedure on priming the fuel system.