I own a 2008 XF, which I purchased new and it now has 30,000 miles. Car has been regularly and well-maintained. There is a persistent buzz coming from the rear of car that I believe is from the fuel pump. I am prepared to replace it. My question is which fuel pump to buy? The prices range from $20 on eBay to $252 from Autozone. At Autohaus, a Bosh fuel pump is $147. It's recognize the quality of a product will cost more, but this is not always the case. I've done an extensive search in our files but cannot find anything regarding the preferred fuel pump and price point. Will less expensive fuel pumps perform as well? I'd like to hear from those of you who have had some experience, selecting fuel pump brands. What is your recommendation? This is a terrific site that provides so much valuable information. Thank you. XF friends.