The pressure vessels (1) are located under the vehicle at the rear on the underbody. They are surrounded by a safety cage (2) for additional safety.
The components for the CNG system are assigned via a component number of the vehicle identification number and thus to the vehicle. It is not permitted to swap components!
All operations on the CNG system must be recorded in the Checking and Service booklet supplied.
For safety reasons, the pressure vessels are designed for a bursting pressure of more than 500 bar.
The pressure vessels are only filled to 200 bar for safety reasons.
There are two CNG tank modules (3) each with two pressure vessels (1) under the rear of the vehicle. Each pressure vessel has its own safety valve (5).
With operations on the compressed gas system, i.e. the pressure vessels, each valve must be completely closed first using the manual closing device.
After completing operations and for the subsequent pressure check, the safety valves must be re-opened completely.
The compressed gas is conducted to the front to the pressure reducer through the CNG high-pressure line (4) parallel to the petrol lines.
| 1 | CNG pressure vessels | 4 | CNG compressed gas line |
|---|---|---|---|
| 2 | Safety frame | 5 | Safety valves |
| 3 | CNG tank modules |
• Service: The pressure vessels must be checked every five years. This is performed by replacing the tank modules in "Aftersales". A corresponding replacement part range is in preparation.
CNG tank modules
Illustration L0008256 shows the location of the CNG tank modules, each as an assembly of two pressure vessels (2 and 5), and emergency petrol tank (7).
| 1 | CNG tank module cover | 5 | Pressure vessels |
|---|---|---|---|
| 2 | Pressure vessels | 6 | Bracket for exhaust gas system damping ring |
| 3 | Emergency tank gauge | 7 | 15 l emergency tank |
| 4 | Compressed-gas tank retaining strap | 8 | Connection for emergency tank filler pipe |
Protective covers
The CNG tank modules are provided with covers which may only be removed by trained specialist staff.
- 1. Rear CNG tank module cover
- 2. Information on the cover of the rear CNG tank module
- 3. Front CNG tank module cover
Warning information is provided on the covers of the CNG tank modules in the area of the exhaust gas system as well as under the carpet on the floor panel, second row of seats.
Illustration L0008382 shows the safety information.