I'm having the same issue atm.Starting the truck up for the first time on a daily basis,it'll shut off within a cpl seconds,but any time i start it up there after,it runs great!
If you're pressure is reading that low? perhaps the pump is going out on ya bud.How old is the pump? when did ya did ya get it? ask yourself these q's.
My pump's basically brand spanking new and already i believe it's giving out.Thank goodness for that 1 yr warranty!
Best way to tell is get the codes.they'll tell you exactly whats wrong.....go to the website below,read all of it and follow the directions.just like i had to do yest.
or perhaps your injectors are clogged up.if so,go buy "fuel injector cleaner" at family dollar/dollar general for 2.50 (cheap and worth it).You may need to buy it 3-5 diff times but in the end,worth it.talking from experience.
always stick w/the cheapest route first for testing the prob out (buying new fuel filter,getting codes,checking spark plugs,etc)