Tobias, I do have an update to what I hear (sometimes). As far as I can tell it has to do with the EVAP system. At this point, I don't think it's a problem just annoying sometimes. I have finally realized that it only makes the pulsating/clicking noise at the back of the vehicle after a fuel fill up. The other day after a fill up I parked in the garage and it was doing it. Later drove for a while (got the gas level down some) and it was not doing it. Then I make a point of filling up again just to the point that the pump shuts off (which you are supposed to do anyway). Got it in the garage and it was doing the noise some and then quit. My guess is that the gas tank can be somewhat over full and the EVAP system is purging vapors. I'm by no means a mechanic, but that is what I think at this point. If the gas level in the tank is down some it will not do it. So, for now I think it is OK, but maybe somebody else has another idea.