Fuel pump wiring

I have replaced the fuel pump, fuel filter,and pigtail connector which goes to the fuel pump. Before doing these things,I will shed a little light on why I changed those things. I would drive about 15 miles and then the car would act like it was not getting any fuel and quit. So if I let it sit for about half hour it would usually start back up. Or sometimes if I added gas to it.
Which takes me to my next issue that I am going to address. When we changed the old pump with the new one and put everything back together the car would not start. So with further inspection I was told that the 4 wires that connect to the fuel pump itself were somehow pinched under a brake line when whoever changed the brake line.
So moving the 4 wires around plugged it back in and it started.
As I said above I changed the pigtail connector for the pump,thinking that it would fix my issue that I have now. What happens is I will start the car and drive it with no problems. Then I maybe 2 hours or even overnight I will try to start it and it won’t start. If I crawl under the car and reach my hand up around the gas tank where the 4 wires run to and move them around to what spot seems to work then it will start.
I have checked my Relay also. I am wondering however if a failing oil pressure switch would have anything to do with this? It seems like it has to be those wires,because then why does it seem to get fuel to the pump after i move those wires around.
I do not know where the 4 wires from the pump lead to?
Hope I have been specific enough. I could use any help at this point.
Thank you.