I have a 2008 Audy A4 2.0T this car runs for 20 to 30 minutes and shuts down, I installed the fuel pressure gauge and the fuel pressure goes down and the engine shuts off, I have change the fuel filter, the high pressure fuel pump, the low pressure fuel pump. the low pressure fuel pump module, the fuel pressure sensor. I look for the fuel pump rely but I could't find it. The low pressure fuel pump has no power, why?. Please help

 

I have a same problem tell me plz did you find it...