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Service bulletin SB-49-11

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10055494
Published by NHTSA2014-06-04
Manufacturer's numberSB-49-11
Manufacturer's date2014-02-01
NHTSA componentFUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY

NHTSA's summary

WESTERN STAR: IF DIESEL EXHAUST FLUID (DEF) SYSTEMS IS SITTING FOR EXTENDED TIME, IN TANK, WILL CRYSTALLIZE AROUND FLOAT OF LEVEL SENDING UNIT TUBE AND NEEDS CLEANING TO PREVENT A FALSE OR INCORRECT GAUGE READING. MODEL CONSTALLATION, 4700, 4800, 4900, 5900, 6900. NO YEARS LISTED. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Fuel system, Fuel tank

Vehicles listed
WESTERN STAR 47002014
WESTERN STAR 49002014
WESTERN STAR 69002014
WESTERN STAR CONSTELLATION2012

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
0607-172019-04-08. Service bulletin. SPN 96 (MCM) (GHG17)
707-132018-06-18. Service bulletin. 707-13 Description and Operation of the HC Doser Fuel Supply Pressure Control Valve - Two Filter System
611-132018-06-18. Service bulletin. 611-13 Removal and Installation of the GHG14 Six-Gallon Diesel Exhaust Fluid Tank Header
0127-172018-04-16. Service bulletin. 0127-17 SPN 1077 FMI 14 (GHG14) (GHG17) (MCM)
1110-142017-10-21. Service bulletin. 1110-14 EPA10 DOC Inlet Pressure Sensor
WS-49-132014-06-05. Service bulletin. WESTERN STAR: AT RETURN LINE FITTING, DURING COLD EXTREME TEMPERATURES, THE DIESEL EXHAUST FLUID (DEF) TANK WOULD FREEZE. *PE
WSB-49-112014-02-13. Service bulletin. 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