I am not sure if it is the bubbles in fuel causing stalling but if it is then like Dezzy said they can only enter the stream before pump. So the issue could be pump incorrectly seated or seals failed. You say they filled in more fuel- how much? Try at least 1/2 tank. After that turn ignition on and off several times couple of seconds at the time to allow pump to circulate the fuel and get rid of air. You should be able to hear bubbles going through system and reduce with time as you cycle ignition.
If it's not because of the bubbles then then it could be immobilizer again like Dezzy said. Does the IMMO light come on with ignition and then go off? There would also be fault code stored in ECU and immobilizer.
Other things could be MAF, throttle body with associated wiring or vacuum leak.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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