I accidentally posted this in the L322 section. I have a 2016 L405 SC and have a intermittent buzzing noise coming from spare tire area. Starts then will stop. If I coast it dies down and when I speed up it gets louder. I thought it might be the air suspension compressor but was commented on in the L322 technical that it might be the fuel pump. I was very familiar with my L322 but still getting up on my L405. Any comments would be appreciated. Does anyone know if the fuel pump is difficult to replace? Thanks!