2006 1.9 tdi dsg engine stops after 2-3 min when drive

[Bcddy56]

I had some fuel leak with full tank so took it to a garage to fix it. They had to drop the tank and replace the seal over the fuel pump. Next morning my car didnÂ’t started. They came and helped to start with a spray into the engine and said it was because the fuel was low (they didinÂ’t tell me I should refuel straight away canÂ’t wait till morning (it was above the red line with 1 more line so not empty). Used it all day, without any problem. On the next day when the engine was hot, sometimes started really hard (just like when my fuel pump was dying in the past - though that time it was constant no it was occasionally). Took it back to the garage and they checked next morning when it was spot on. During that day the start was sometimes good but a few times bad again. The next day on after my third stop the engine didnÂ’t started just like the first day but with half a tank. Asked a nearby garage to spray it and drove it to a VW specialist. He said, if it is not doing when the computer is on, he canÂ’t do anything. Drove off the garage, 3 mins later when I slow down at a roundabaut, the engine just stopped, and wasnÂ’t able to start again. Ever since it need the spray to start, and after 2-3 mins it stops when I slow down.
Here is the list what the mechanist changed/tried:
Change fuel pump
Took off EGR
Took of the sensor for the airflow
Replace relay to the pump/injectors
Readjusted injectors back to standard

I know it was long, thank you if you read until this point.
If anyone has any idea what can cause it, please help.

[Crasher]

Check the arrows on the pipes on the fuel tank top, feed black, return blue

This is an R32 but it is the same

[Bcddy56]

Next week we will definitely try, thanks for it.