Bencina pump problems

I had a similar problem, these pumps have a breathing hole .... My problem was that the pressure of the motor cylinders was not at its optimal point and causing the time of its strength career to escape pressure between the piston rings causing the oil to splashed everything inside the engine until it leave I changed it did not endure ... try first pressure on the cylinders with gang

Thanks Chpe for answering.

My consultation arises, in case the pressure is that the rings are with problems.

To be more specific the engine cylindors were then oval the piston or rings segments failed I worked well, it was not covered because it was covered and the pressure that was generated sought where to get out