{"nhtsa_id":10055512,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2014-06-05","date":"2014-03-01","document_id":"WS-49-14","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY","mfr_system":null,"summary":"WESTERN: THE 13 AND 23 GALLON DIESEL EXHAUST FLUID (DEF) TANKS TAKE COMPRESSION SET AND LEAKS, AT O RINGS IN COOLANT VALVE DURING EXTREME COLD CONDITIONS AND AN O RING REPLACEMENT IS AVAILABLE TO FIX LEAK. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10055512","components":[{"id":"fuel-system","name":"Fuel system","parent":null},{"id":"fuel-tank","name":"Fuel tank","parent":"fuel-system"}],"codes":[],"topics":[],"vehicles":[{"make":"WESTERN STAR","model":"WESTERN STAR","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"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.","attribution":[]}