System and method for vibration resistant rollover valve

1. A system, comprising:

a reservoir chamber;

a vent tube to vent gases from the reservoir chamber;

walls between the reservoir chamber and the vent tube, the walls providing a seat and forming a cavity at an opening of the vent tube;

a floor of the cavity, the floor including a convex portion protruding from the floor; and

a stopper positioned in the cavity for sitting in the seat during a rollover situation.

2. The system of claim 1 , wherein the walls are angled away from the seat at an angle between 30 degrees and 50 degrees.

3. The system of claim 1 , wherein the convex portion is positioned in a center of the floor.

4. The system of claim 1 , wherein a shape of the convex portion includes a dimple.

5. The system of claim 1 , wherein the walls are straight.

6. The system of claim 1 , wherein the walls are curved.

7. The system of claim 1 , wherein the floor comprises a cup sitting within the cavity.

8. The system of claim 7 , wherein the cup sits within spaced legs forming alternatively spaced flow path openings.

9. The system of claim 1 , wherein the stopper comprises a ball.

10. A fuel delivery system of an engine, comprising:

a cavity formed between a reservoir chamber and a vent tube, the cavity forming a seat at an entrance of the vent tube;

a stopper positioned in the cavity for sitting in the seat during a rollover situation; and

a floor of the cavity, the floor including a convex portion protruding from the floor to prevent the stopper from sitting in the seat during normal operation.

11. The fuel delivery system of claim 10 , wherein the stopper comprises a ball.

12. The fuel delivery system of claim 10 , wherein the convex portion comprises a dimple.

13. The fuel delivery system of claim 12 , wherein the dimple comprises a round shape.

14. A method, comprising:

providing a reservoir chamber for a fuel delivery system of an engine and a vent tube to vent the reservoir chamber;

allowing the vent tube to vent fuel vapors out of the reservoir chamber during normal operation;

blocking the vent tube with a stopper during a rollover situation to prevent fuel from flowing out of the reservoir chamber via the vent tube; and

providing a cavity with a floor having a dimple below the vent tube, the dimple to prevent the stopper from blocking the vent tube during normal operation.

15. The method of claim 14 , further comprising the stopper unblocking the vent tube when the engine is back in a normal position.