Having just moved from a '99 GU II to a 2012 model I noticed a change in the way that the sub tank pump operates. In the old car, the transfer pump operated for a short period every time the car was started, and must have been setup to transfer fuel periodically based on the level in the main tank. Effectively, If I never touched the Sub tank switch and simply kept driving the sub and main tanks would both be close to empty at the same time. In the new one, the transfer pump only operates if I press the switch. As I always keep both tanks full, if I don't remember to run the transfer pump every once in a while, I could end up with a sub tank full of stale fuel. Is this normal, or is there maybe something wrong with my car.