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...

 

Check the fuel pump relay (J17) under the ECU in the plenum chamber—it may be faulty or have corroded connections. Also, inspect the fuel pump fuse (typically under the driver’s side dashboard or engine bay). Since the low-pressure fuel pump module (J538) has been replaced, verify it’s receiving power and properly connected. Lastly, test the wiring from the relay/module to the pump for continuity and voltage, as a bad ground or broken wire could be the issue. If no power reaches the pump while cranking, the relay or wiring is likely the culprit.