1988 Chevy Blazer oil pump

If your oil pump is bad and there is a lack of oil pressure the engine will make all kinds of noise to let you know that it is unhappy. You would first hear like clicking or lifter noise then it deepen to a lower end knock then eventually seaze up and be done. Now if you didn't hear any noise then you need to put a guage on it and see what the pressure really is. Now if the engine has been rebuilt recently it may be the oil pump pick up came off. This happens alot as they forget to red lock tite it or spot weld it to the pump. What I do is red lock tight it. First I put the pump on and then put the screen in so I can move it then I put a 5/16 nut on it and put the pan on with out the gasket this gives me clearence then I mark the pump and the screen so I know where to put it then red lock tite and put it in place have never had one fall off.