i opened the bonnet today as there was a smell of fuel (and mpg has been bad) ive had a few 'spots' under the car when i park for a while but always thought it was oil -ts actually been caused buy a small leek from somewere dripping down the oil filter, i now think this may have been fuel, the area in the middle of the photo seems covered in fuel, im going to gunk the whole engine and run it up to see if i can work out were its coming from but any advice ? there is not anything splashing around that i can see... were do i start?