One problem related to fuel delivery has been reported for the 2003 Infiniti G35. The most recently reported issues are listed below.
Noise coming from engine when air-conditioning is on. Seemed to get louder. Took into dealer, assumed it would be covered under warranty. Had 60,000 warranty was at 54,000. Also gas tank not showing full when filling up. Both repairs totaled 1100. 00 aproximately felt at 54,000 miles these should not have happened. I bought the car used and was told I had the remainder of factory warranty which was 4 years/60,000. I was not aware the first sale date was late 2002 apparently.