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Service bulletin TSB170057-042620

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 id10110334
Published by NHTSA2017-08-04
Manufacturer's numberTSB170057-042620
Manufacturer's date2017-04-26
NHTSA componentENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE; EQUIPMENT:MECHANICAL

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of the hard start or fault code 559 or 4691 caused by an air leak in fuel system caused by incorrect installation of Navistar® supplied washer between Navistar® supplied fuel inlet fitting and Cummins® supplied priming pump filter head.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Equipment and accessories, Fuel system

Vehicles listed
CUMMINS B6.7
CUMMINS ISB6.7

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