Following up on my Focus 2.0 TDCi issues, I changed the fuel filter today in the hope that a new filter/seal would stop the air which is being drawn into my fuel line somewhere. It was a pig to bleed the system afterwards and it didn't fix the problem.
Every 30 seconds or so, I'm getting about 2-3 seconds worth of air bubbles coming out of the fuel filter. Unfortunately, the line from the tank to the filter is not clear so I can't see if there are air bubbles coming into the filter. In response to Mr C's suggestion, I made sure the tank was completely full.
The thing is, I can't hear the fuel pump running. I turned the ignition on (but engine off) and lifted the rear seat and listened at the top of the tank but I can't hear anything. I have checked the fuel pump fuse and its fine. Should I be able to hear the pump running?