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Service bulletin TSB-028

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 id10131591
Published by NHTSA2018-04-02
Manufacturer's numberTSB-028
Manufacturer's date2018-01-12
NHTSA componentFUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES

NHTSA's summary

Quantum has been advised by the supplier of the PRV, that the PRV spring used to directly control the venting pressure may not have been properly processed resulting in inconsistent spring pressure. This spring variation can result in erratic and unpredictable activation of the PRV valve.

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 tank

Vehicles listed
QUANTUM FUEL SYSTEMS LLC. CNG FUEL SYSTEM

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