Ram Trucks 2012 3500 - CNG Supplement - Manual (Page 33)

Retest dates must be stamped on the exposed metallic
surface of the container neck or marked on a label
securely affixed to the container and overcoated with
epoxy near the original test date. Reheat treatment or
repair of rejected containers is not authorized.
The fuel containers expire and must be removed from
service fifteen years from the date of manufacture. A label
on the fuel container states the first container inspection
date and container expiration date.
It is recommended that the fuel system components be
inspected periodically for leaks and/or excessive wear.
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MAINTAINING YOUR VEHICLE 31