Maruti m800 ac
Some manufacturing defect due to which fuel tank get leaked

I have bought maruti m 800 in july. since den when ever i got my car filled with 5lt or above petrol, the car fuel tank gets leaked out. there is some technical or manufacuturing defect as when ever the petrol filled in car is less than 5 lt nothing happend.

in 5 yrs this time it would be my 5th consecutive time that i have to get the fuel tank changed.

kindly help what should i do