{"nhtsa_id":635303,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-21","date":"2002-05-01","document_id":"0921","mfr_campaign":null,"replaces":"0921","component":"FUEL SYSTEM, GASOLINE:CARBURETOR SYSTEM","mfr_system":null,"summary":"SUBJECT REGARDING DEEP SUMP COVER ASSEMBLY KIT FOR VEHICLES BUILT PRIOR TO FEBRUARY 19, 2001, WITH SMALL AMOUNT OF WATER COLLECTING IN THE LOWEST PORTION OF THE AIR CLEANER COVER AND NOT DRAINING EFFECTIVELY THROUGH THE VACUATOR VALVE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/635303","components":[{"id":"fuel-system","name":"Fuel system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"BUSINESS CLASS","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":[]}