I am having starting issues when my car warms up.

What is your question?

Once my 1992 Volvo 740 wagon warms up after for example a drive to a near by store. I turn it off then try and restart it up and at it will do is make a bunch of cranking noises. It wants to start but it wont. After hours have gone by it will start again and the same issue happens over and over. I have just recently replaced the fuel injectors, cam crank shaft sensor, spark plugs, spark plug wires, and the distrubitor cap and the car is still having the same exact starting issues. I can hear the fuel pump rotating before I turn the car over so I know it's at least not the fuel pump under the driver seat. I know it has 2 fuel pumps so I am not sure if the second pump is out? Today I had the fuel pump relay replaced and so far the car is starting up great without any issues.