There was an issue woth early Fs regarding perforated tanks, but this was supposed to be sorted oout by 1998 or so, so your F is highly unlikely to have this problem.
Therefore its probably a blocked breather pipe to the petrol tank, have you got a warrantee with the car? If so i'd get it booked in and have it checked out.
Therefore its probably a blocked breather pipe to the petrol tank, have you got a warrantee with the car? If so i'd get it booked in and have it checked out.