hi.. 2001. 2dti vectra.... when car has been filled to top and left overnight.. there is a small amount of fuel on floor and tank is a little wet ..when the car has covered about 80 mile approx it never leaks again until the car is refilled to top... i cant see the top of tank.. where it must be coming from..is there any hoses up there which are known to leak..any help would be great as i am not a mechanic...if it does need any hoses which is the best way to fix them...regards..jim