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Service bulletin ENP-683

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 id10152409
Published by NHTSA2018-12-17
Manufacturer's numberENP-683
Manufacturer's date2018-11-30
NHTSA componentFUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES

NHTSA's summary

This is a precautionary reminder that Cummins ISX12N (near zero emission) engines (including Pony Tanks used for temporary fueling) require lower fuel pressure input than previous models. A retro-fit is available to convert existing Pony Tanks to the lower fuel pressure.

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
AGILITY FUEL SYSTEMS CNG FUEL SYSTEM

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