Could be a combination of weak HPOP and low fuel pressure and slow starter motor and weak batteries.
What a run on sentence... LOL.... anyway, that's where I'd start. My starter went out about 3 months ago. The new one spins the motor at least twice as fast as the old one used to. Huge difference. If you got weak batteries and/or weak starter motor then it won't spin the engine fast enough to get it started.
You can buy an adapter to put a fuel gauge on the fuel bowl. Maybe $40 all in if that. Nice to have anyhow. Places like www.princessauto.com
sell gauges dirt cheap.
What happens when you shoot a small pffft of WD40 into the turbo intake (air filter box removed) when you start it stone cold? Don't freak out, I'm talking a very small shot of spray. If it fires up instantly maybe it's a fuel side problem. If it doesn't make a difference then glow plug issue?
In any case, don't throw parts at it. Find somebody with that Autoenginuity or whatever scanner to check IPR and ICP function. Post up and ask here if anybody in your local area can help you out.
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2001 F250 4x4 crew lariat 7.3L auto, DP Tuner F5 no-start/valet/20tow/80econo/140aggressive, NAPC 450series trans w/billet triple disc TC, ISSPRO egt/boost/pyro, foil delete, 6" stainless tip, Magnaflow 17979 4" turbo-back, dieselsite boots & coolant filter kit, HX crossover, boost fooler, 6.0L trans cooler, ported turbo housing, DIY 6637 Tymar, billet grill, line-x bedliner, tint, 08' alum diff cover, clear corners & tails, 20w LED taillight bulbs, cheap OPT7 HID kit, 2000w inverter, Tekonsha Primus brake controller, 220A HD alternator, 120w LED light bar up front, 2x18w led spots backup lights, 145USgal tidy tank, superlift 4" kit full springs & bilstein 5125 shocks, Level8 striker 16x8.5 blk rims, etc.
2009 VW Jetta 2.0TDI 6spd Highline full load except nav. 19" Audi RS6 rims. REVO tuned. Aftermarket android 4.2 navi 7" touch head unit, Custom fiberglass box MD Sound 12" & Boss NXD5500 amp. GTI grille and projector fogs.
BioPro190 owner. 20,000L produced 2010-2015.