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Service bulletin TIB-44-020

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 id10042785
Published by NHTSA2012-01-11
Manufacturer's numberTIB-44-020
Manufacturer's date2011-11-22
NHTSA componentFUEL SYSTEM, OTHER:FUEL FILTER; FUEL SYSTEM, OTHER:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS; FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

NHTSA's summary

KENWORTH: INFORMATION REGARDING ORIGINAL EQUIPMENT FITTINGS NOT MATING PERFECTLY AND RESULT IN LEAKS AND/OR AIR INGESTION DUE TO THE 37 DEGREE FITTINGS FLARED FUEL LINE TO FUEL FILTER FITTINGS INSTEAD OF THE 45 DEGREE. *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 filter, Fuel hoses and lines

Vehicles listed
KENWORTH T4402011
KENWORTH T4702011

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