Intermittent will not start issue

i am having problems with my car, sometimes it will start and sometimes it won't. When it won't start i am not getting any fuel from the Schrader valve because the fuel pump doesn't prime, but i have just replaced the fuel pump and fuel injectors thinking that was the problem. i don't want to keep changing parts. In order for me to get it to start i must put carburetor cleaner, starting fluid, or gas whichever i decide that day and put it directly into the throttle body and then fire it up give it gas and then it runs fine. I have done this also after it not starting and leaving the key in the on position and it will it start every time with no fuel pump cycling.