arccstic

Hi, I have a 2001 Galaxy tdi .I was driving down the motorway when it just cut out, now It won't start. I had it to a garage and they said it was the fuel pump so I have replaced the fuel pump in the fuel tank, that didn't make much difference although it does now start but cuts out after about 20 seconds. I have checked the relays they are fine. If I connect the battery straight to the fuel pump and the car works, If i pour the diesel into where the top pump is, it works.. so both pumps are fine- yet no diesel is getting from the bottom pump to the top one. Any ideas? Shell