I have a 2007 Scenic 1.9 Dci Dynamique. About three weeks ago I had to call the breakdown service as the engine would not start. The technician did various tests and found that an air blockage in the fuel line was the problem. Initially, this was an intermittent problem but now I have to pump the air bleed thingy everytime I go to start the engine. Any ideas of what the fault is and how to fix it?