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[FlyMarines09]

I recently bought a 04 F-250 4x4. Truck has been running great up until yesturday. It has 102k, 2k from myself, I cleaned out the injectors, put fuel additive in, replaced all of the filters, changed the oil, all that jazz. In other words, I'm taking very good care of it. Glow plugs were just replaced.

I went to go start it up before work, and the darn thing wouldn't start. It turns over, tach reads 100rpm, but there wasn't any ignition. I hear the fuel pump running, and the glow plugs thump. I opened up the fuel filters, theres nothing clogged, or guncked up. Fuel is running through all the lines. I didn't have time to really do anything about it then, later that night, I went back out to start it and it started right up, no problem.
Today, the same thing happend... wouldn't start, opend up the filters again, same thing... No obvious problems. Wouldnt start, wouldn't start, wouldn't start.... 2 hours later, started right up. Drove around a bit, shut it down, waited and again, started back up.

I just put fresh fuel in, so idk if maybe I had a bad batch of fuel. I made sure there wasn't any water, or even unleaded gasoline in it. I can't figure out why it's acting weird. I did some research, and maybe it the HP oil res not getting enough pressure to the injectors. I really don't know why it's acting fine one minute and not the next...

Any suggestions?