Just been outside to have a look - its a metal fuel cap cover but seems to be a problem with the catch as it does sit flush if you push it in a couple of mm Misfire im fingers crossed is fixed - its done less than 500 mile in 2 year and even then its been on short journeys so im hoping my bottle of injector cleaner and a good drive has done the trick. Oil is somewhere under the cover going to take it off tomorrow and investigate it wasn't there when I looked at the car just appeared on the way home :/
I thought it might be a a stick over cover and the thickness of the cover made it not sit flush. Like this one off ebay..... http://www.ebay.co.uk/itm/CT-RACING...arts_Vehicles_CarParts_SM&hash=item3cd4639699 The fuel flap is held closed by a spring loaded plunger and you might be able to bend the tag the plunger goes into to make it close a bit tighter. Anyway, best of luck with the problems.
Hi SarahB, welcome to Copenworld. I see Trustafox & DAG have been looking after you. Silver Minilites were a genuine accessory option from Daihatsu. They work well on a Black Copen. 500 miles in 2 years. If it hasn't had a oil change in that period, I'd get that sorted. My guess is the oil leak is from the oil filter joint.