My 1999 Mercedes s500 noisy fuel pump was replaced but the new one is making the same loud wining noise when it gets hot, they also replaced the fuel filter as well. It's it the type of manufactor pump being used or is there another part somewhere in there that kills the noise? What helps to clean up maybe carbon build up? My macahic poured some engine cleaner some kind of solvent cleaner and told me to drive it over the weekend, then I went in for a oil change. But still have the ticking noise. It's not as loud and it comes and go now. Meinly at cool start it's fine but as I drive around town it comes. If I take it out on the open highway and open her up it sometimes go away. Ugh frustrated.....
RepairPal Certified shops can diagnose and repair your 1999 Mercedes-Benz S500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
