So my battery is on the way out and I've had to get jump starts of mates to get around for the last few days before I can replace the battery at the weekend!

However after we jump started the car today on my way home I noticed the fuel gauge was reading zero - but I know for certain I have over half a tank of fuel in there. Is this a normal side effect of running the battery completely flat?? (my stereo and trip computers have all reset as well).

Is there anything else I need to reset/watch out for? How do I fix the fuel gauge??