When I start the vehicle for the first time, on screen a warning sign says "Limited Warning" with three beep sounds i have full tank of diesel i dont know what is it, i heard that is fuel pump but what confuses me is that this thing this message only pop up when there is low diesel in tank and when i am driving my car it starts not everytime tough when my father startes car there is no warning at all but the warning just comes when car want so please help me.