GM Service Manual Online
For 1990-2009 cars only

Caution: Do not remove the CNG fuel tank cover and then drive your vehicle. Road debris can damage the CNG fuel system components and cause a leak. You or someone else could be injured.

The bi-fuel and dedicated CNG vehicles have two fuel tanks mounted under the body at the rear of the vehicle and the dedicated CNG vehicle has a third mounted horizontally between the front and rear axles. A cover protects the tanks from damage caused by road debris. The cover should only be removed to perform inspection or service.