Can someone explain how the sub-tank works? I have a 2002 3.0 GU.
I press the sub-tank button and the light comes on. About 2 minutes later it goes off. Is this normal or do I need to get this sorted?
I have a near full main tank and wanted to run off the sub to make sure it was working fine.
The vehicle is new to me and is my first patrol so I have no idea what is supposed to happen.