Cummins QSB3.9, QSB4.5 & QSB5.9 CM55X (VP30) Wiring Diagram (Bulletin 4021399)

Bulletin 4021399 is the wiring diagram for the Cummins QSB3.9, QSB4.5 and QSB5.9 industrial engines with the CM55X controller and the Bosch VP30 rotary injection pump. It applies to ECM part number 3990517.

It includes the engine wiring schematic, ECM connector views and pinouts, the VP30 pump wiring and the sensor wiring. These engines power loaders, telehandlers, compressors and generator sets from many manufacturers. When the machine maker's manual stops at the engine connector, this diagram carries on.

What the diagrams show

• Engine wiring schematic
• ECM connector views and pinouts
• VP30 pump wiring
• Sensor wiring

Compatibility

• Models: QSB3.9, QSB4.5, QSB5.9
• Control module: CM55X
• Fuel system: Bosch VP30 rotary pump
• ECM part number: 3990517
• Publication: Bulletin 4021399
• Document type: Wiring diagram

Before you buy

Check the ECM part number on your engine. This diagram applies to 3990517 with the VP30 pump.

Your engine's dataplate shows the engine model, the engine serial number (ESN) and the CPL number. Compare those with the models above. If you're not sure, email us the dataplate details and we'll check for you.

File format

PDF download. Nothing is shipped. Opens on a computer, tablet or phone.

We're an independent seller and are not affiliated with or endorsed by Cummins. Brand and model names are used only to identify the engines this manual covers.