Laville1989

Hi all, new member here, sorry if this is in the wrong place. I'm loosing coolant in my x-type 2.5 V6, no apparent leaks, and the coolant reservoir smells like petrol/fumes. The engine runs sweet, does not overheat or anything, no steam from the exhausts. No other symptoms, just coolant loss and petrol smell in coolant. Is this one of the head gaskets? Many thanks for any replies