Cummins wiring diagram, Bulletin 4021399, for the QSB3.9, QSB4.5, and QSB5.9 industrial engines with CM55X electronic control and VP30 fuel injection pump, ECM part number 3990517.
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This is the Cummins factory wiring diagram, Bulletin 4021399, for the QSB3.9, QSB4.5, and QSB5.9 industrial B-Series engines with CM55X electronic control and VP30 rotary fuel injection pump, covering ECM part number 3990517.
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| Manufacturer | Cummins |
|---|---|
| Engine Family | B-Series (QSB3.9, QSB4.5, QSB5.9) |
| Electronic Control / Fuel System | CM55X, VP30 rotary pump |
| ECM Part Number | 3990517 |
| Publication Reference | Bulletin 4021399 |
| Format / Language | PDF / English |
The layout was neat and convenient to reference when checking wiring connections and system details.
The diagram was clearly organized and easy to follow. The electrical information was straightforward to review.
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