How do you check the oil pump to make sure it's good? In my case this tool saved me a lot of labor, because the brand new Melling oil pump was bad and I had to get a different one. It's was nice to know that before put the motor in the car and started it up! Darndest thing I've ever seen. Oil leaking out between the body and back plate of the pump. I don't know what has happened to quality in the country the last couple of years.