Although the mechanic tells you that the car deposit is fine, you have a small problem, as small as a hole in the fuel suction tube inside the tank, so that it behaves like a flute, when the tank is emptied below the hole, it begins to take a breath through it (it is easier to suck air than liquid).
When taking a breath, the bubbles go to the filter and the food circuit of the car, and depending on whether it is diesel or gasoline will present greater or lower problems to the point of stopping and needing technical help to put it back in the case of diesel.
You have to disassemble the registration plug of the agor, which is located below the rear ascending, and examine it carefully to see the state of the fuel suction tube.
All the best.