Isx 435ST issues

[Kentuckyshuffle]

I have a 2010 international prostar with the isx 435St in the mornings when I start up sometimes it needs a little push of starting fluid to get her going. I’ve noticed if I top of the fuel tanks before I shut her down she will start back up but if I’m down around 1/2 tank she won’t start after sitting few hours. I’ve read a lot about stuff on here about the high pressure fuel pump but I can’t find any information about the 435St motor any help will help please