This is ungottable, try to consult with any authentic mechanic or prefer your regular one.
I own a car 64000K.M on odo. Previously I used to have system too lean error which was removed by replacing fuel pump. But for now the car shows an eratoc behaviour. Check engine light comes on when fuel tank level falls below 30 pc indicating system too lean condition and is gone when fuel tank is refilled to full. But engine is also low on power. Shows knocking and vibration in engine at idle speed. Have gone check through almost every part but still unable to figure out. Ur help will be a great relief to me. Car details are as follows