Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Fuel

FUEL
Use CNG that meets the specifications of SAE J1616. These specifications place limits on particulate contamination and moisture content. Prolonged usage of natural gas with no lubricating oil (dry CNG) may cause injector failure.

CNG that does not meet these requirements may cause fuel system or engine damage. If your GM dealer determines that the cause of the condition is the grade or quality of CNG used, repairs may not be covered under warranty.