Fap fluid run out too fast

[vajdaviktor]

I have a 2.0d Volvo C70 with a PSA engine.
Engine code: D4204T
km: 110,000
My problem is that the FAP fluid runs out very quickly after filling it up.
It goes up to 5,000 km with 1 liter filling.
The car has no fault codes.
The FAP tank is not broken, the pump and the level sensor are not faulty.
I have already replaced the ADM module under the rear seat.
The brand service cannot solve the problem either (there is no error code).
Does anyone have any tips on what could be causing the pump to empty the tank?

Thanks.