MD I just got my rear trunk bars in today. And mine don't interfear with the filler neck. Unless it's way different you should not have a problem. How far back do your bars go? Mine are all the way back to the rear of the car. And are a good 6-8 inches from the filler neck. My trunk bars ended up being about 80 inches long. How long are yours? I'll see if I can get you a pic of them in the morning.