I've gone through a fuel leak with my very first car, worst case scenario it's an experience no one wants, the block broke.
Anyways, it is not just condensation? You say on the top part of the engine?
As for me, my Fuel light started turning ON, then it would turn OFF once I pressed the gas more and not just cruising. If it is on Cruise Control, it never happens. If it's a steep slop, it turns ON.
Now this only happens if the gas tank is below the half-way mark, or if I'm cruising at a steady ## mph. I've added about a half a quart since the engine oil measured out to a little under half. It is a leak or just condesation?
95 S420 (W140) | IForged