so it sounds like the valve is the first thing to check. So you unscrew the line to see if it is there, if not check to see if it fell inside? It sounded like it can be "missing" on some models?
so if has fallen or floated do I just set it back and thats it or do I still need a new pump?
Also, the repair kits have this check valve in them?
Thanks for the quick responses. I need to have the car up and running fast. To replace pump, do you need to remove radiator and belts, or can you slide it out without having to do that (83 SD USA)