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Service bulletin SB 3112

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 id10140451
Published by NHTSA2018-06-11
Manufacturer's numberSB 3112
Manufacturer's date2018-05-31
NHTSA componentFUEL SYSTEM, OTHER:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS; FUEL SYSTEM, OTHER

NHTSA's summary

This Service Bulletin informs affected owners of D series coaches with CNG fuel systems to remove the orifice located in the fuel regulator coolant supply hose. This will allow a greater volume of warm water to reach the fuel pressure regulator, which will reduce the chance of ice buildup on the fuel supply hose.

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

Fuel system, Fuel hoses and lines

Vehicles listed
MCI D SERIES
MCI MCI

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