Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Dark fluid on ground near Gas filler Hose › Reply To: Dark fluid on ground near Gas filler Hose May 25, 2021 at 6:26 am #990698 Richard KirshyParticipant If it is fuel leaking it could be washing off undercoating from you vehicle or the ground under your car was already oil stained or dirty.