Fuel System R2.8 CM2220 R101B Page 1-12 Section 1 - Installation by Subsystem WARNING The engine HPCR fuel system, lines, injectors and fitting must not be modified or changed in any manner. High-pressure fuel spray can cause serious injury or death. The R2.8 CM2220 R101B engine utilizes a high-pressure common rail (HPCR) fuel system. Certain modifications to the fuel supply, return lines and the fuel tank can possibly be required. Be sure the fuel tank is clean and empty until all fuel connections are completed. Place a Diesel Fuel Only sticker on or near the fuel fill cap compartment of the vehicle.
The fuel supply connection is typically located on the side of the tank near the bottom, or on the top of the tank with a drop tube used to pick up fuel near the bottom of the tank. Good design practice is to pick up fuel near the center of the tank to minimize sloshing effects, and locate the pickup a short distance, about 25 mm [1 in], above the bottom of the tank to allow for space for condensate and dirt to collect. If a drop tube is used, it must be well supported to prevent cracking due to vibration in service. The drop tube assembly must be completely airtight to prevent aeration of the fuel supply.
The fuel return flow from the engine must enter the tank below the fuel level in the tank, and be separated from the supply connection in the tank by a minimum of 305 mm [12 in]. To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com