Opel Astra 2004 Manuel D'utilisation page 33

Pressure gauge/
fuel gauge
The gauge shows the tank pressure or
quantity of petrol depending on the
operating mode.
The tank pressure is proportional to the gas
temperature. Therefore the pressure
gauge can fluctuate in natural gas
operation.
Note:
The pressure/fuel gauge only supplies
correct values when the engine is running.
Natural gas
mode:
Pointer in red
warning zone
or Y flashing
= Reserve Section
of Tank.
Pointer in red
warning zone
or Y flashing = Lower reserve
section, the vehicle
will soon change
over into petrol
mode, see page 30.
Display:
1/1 - tank pressure approx. 200 bar
3/4 - tank pressure approx. 150 bar
1/2 - tank pressure approx. 100 bar
1/4 - tank pressure approx. 50 bar.
To obtain the maximum range in natural
gas mode, we recommend that the entire
reserve zone be used.
31
Petrol mode:
Display:
1/1 - tank contents approx. 14 litres
If there is little fuel in the tank the engine
can falter when travelling round bends.
Therefore refuel immediately when the
control indicator Y is flashing!
Never let the petrol tank run dry!