hard to start '97 7.3

[ford_cummins83]

It was brought to me saying the glow plugs were bad, tried to crank it the next morning, tested the gpr which was good, so i started replacing the glow plugs, of course the last one in the driver side head broke off, kept playing with it but couldn't get it out, so i pulled the head, knocked it out and put the head and new hg back on.. i put it all back together and i noticed a fuel leak from the top sensor (1 wire) on the fb.. replaced the sensor, and its still not wanting to start right away.. my hpop reservoir is staying full overnight, and when i go to start it, the first few times it would crank for 10 seconds, shut it off, crank again and it seemed like right after the gauge build oil psi it fired right off and runs good.. but today i cranked it, the gauge went up and it still took awhile to finally bust off..i started to think, oil pressure since when the gauge build psi it fired, but now that it did that im not sure anymore, but if it was fuel wouldn't it kinda hickup and blow some white smoke when it finally started?? oh its a 97 with 120k btw, and i replaced both gaskets and the glow plug/injector harness's.. and with only 120k i wouldn't think the hpop would be bad, and i dont know much about the fuel pump, not much of a 7.3 guy, just trying to help this lady out.. plz help i washed it today so i'll check for more fuel leaks in the morning in the valley but i didn't see any today.. just trying to figure out which way to go.. I just bought a new scanner today so i'll look at the oil psi and i'll open my drain while someone is starting it and make sure its got constant pressure..