Fuel System Operation: Notes
WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
This vehicles primary fuel source is compressed natural gas (CNG). The vehicle will only switch-over to gasoline operation if one of the following conditions is present:
- The fuel tank pressure sensor indicates CNG fuel pressure is below 1,379 kPa (200 psi).
- Every 100th start the vehicle will start and run briefly on gasoline. After this, a switch-over to CNG will occur during the first decel condition.
- A system fault is detected by the PCM.
- The engine cranks for 8 seconds and fails to start on CNG.