We have bought this car 2 weeks ago and realised it was leaking diesel, the local mechanic has replaced the fuel line and all 4 clips and O rings whilst he was it. We took it home and the diesel poured out of it the next day, got taken back in and clip to injector 1 had blown off, sorted and took it back drove it approx. 60 miles and leaking again!! Took back in and injector 3 this time I think...so mechanic ensured every clip was very secure and clicked into place etc, he took it out twice about 5 miles up and down M62, we collected the car and guess what...yip this morning drove 2 miles to work and diesel leaking again plus engine management light on this time (hasn't done that before). When we are experiencing the leaks there is quite abit of black smoke coming out of the exhaust at approx. 50 mph also. We are at our wits end...please has anyone got experience of a similar issue (btwthe mechanic has confirmed the injector seals are fine no signs of carbon, leakages etc...) We did suggest could a build up of pressure be blowing the fuel lines out..but he doesn't seem to think so??? Sorry its a 2009 Fiesta (forgot to add in title)