ok i never seen a Vibrant valve, but you sure there isn't a "up"? i have a flapper around the shop that is a swinging flapper and if the hinge is not "up" it won't seal.
Joe
Theres only a directional arrow on the valve and no matter which direction the flapper is, the same results. Leaks
So now the question is, when you shut the car off, how much force is there going back to the pan from the lines.
If I really blow hard and I mean hard, the valve will close but pressure has to be kept on the flapper.
