Service bulletins for the 2003 Western Star 4900
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
145 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Fuel tank are shown. Show all
| 707-13 | 2018-06-18. Service bulletin. FUEL SYSTEM, DIESEL; FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES; FUEL SYSTEM, GASOLINE. 707-13 Description and Operation of the HC Doser Fuel Supply Pressure Control Valve - Two Filter System |
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| WSB-49-11 | 2014-02-13. Service bulletin. FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY. WESTERN STAR: WHEN TRUCK SITS, FOR ANY EXTENDED PERIOD, WITH A DIESEL EXHAUST FLUID (DEF) SYSTEM, IT WOULD CRYSTALLIZED, IN THE TANK, AROUND FLOAT, ON DEF LEVEL SENDING UNIT TUBE AND NEEDS TO BE CLEANED. *PE |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.