I bet that pump was grenaded because.................. emissions.....
the same process that removes sulfur from fuel also strips lubricants- and most of these pumps use fuel not only to pump, but as a lubricant and a coolant, as well. If you run it dry, you're wearing on parts... you've got to do two things- one is keep the water out, as even a slight amount can wreak havoc... second is add lubricity. there are a number of suitable solutions out there... personally, I like standydine lubricity formula.
as far as the fella here bashing 6.4's, my question is: do you or have you owned one? Don't care about your buddy, or your brothers next door neighbor or any variation of five degrees of separation, I wonder if YOU have owned one? If not, you are taking part in hearsay, and are what you've accused your opponent here of: being an internet wiseguy...
Bill Hewitt is a clown (your vid link)... anyone who knows anything about powerstrokes knows that he is the ultimate interwebz wiseguy, and he makes a living passing dangerous information to people... it's freakin' hilarious to most. unlike Lucy, though, he doesn't always pull the pigskin on chuck- meaning sometimes he's dead on... that is what makes him dangerous. anyone making decisions off of his advice are easily influenced and likely the same ones on the lookout for little green men whilst avoiding Sasquatch.
these diesels, unlike the diesels that ran mechanical solenoid injectors on simple pumps, require/demand maintenance to be done properly and on schedule. oil... coolant... filters... not hard... The power they produce is hard not to play with... lazy people with heavy feet are the cause for the bad rap running them like race cars... head gasket failures on the 6.4 are rare at moderate power levels and driven by folks who's parents didn't buy it for them. don't stomp on a cold engine... never stand on it like a gasser- roll into the power... don't just drop off of high boost creating excessive back pressure- that'll blow a head gasket quick like- ease off the boost. don't idle them for long periods as the pistons will wet stack... this advice is not specific to the 6.4, it's good habits of competent diesel owners, which don't have near the issues of lazy lead footed twits drunk on power.
the ULSD is unavoidable... all you can do is use the extreme maintenance schedule for filters or put a better filtration system on it, and add back at least a hint of the lubricity that existed before the sulfur was removed... cetane for most makers advice is 45... most available on the road is 40... boost the cetane if you can w/ a quality product. EGR's make a mess of intakes and has it's way with oil... either change oil based off of laboratory analysis and advice, or every 5k miles with your fingers crossed. contaminated oil takes out lifters which scar camshafts... reroute your ccv, as the big rigs do- to atmosphere, but do it responsibly by using a catch- bypass gasses mixed with oil mist slop up boots and intercoolers, and they coke on turbo blades- ultimately they make it into the combustion chamber where they burn into the exhaust coking on cats and DPF's, creating backpressure and excessive heat which burns up valve seats and cracks pistons after a while- add to this a regen process and you could take that engine out easily, and it can be avoided by a simple reroute of the CCV which costs $10 or so to do right... again, this advice is not specific to 6.4's or even PSD's, it is simply common knowledge of responsible and savvy diesel owners who understand the difference between gassers and diesels. usually, they actually own one and intend to take care of it, instead of just talk shizen about it on the interwebz every time they can.
but anyway....
I found this site long ago, and because the references in other forums about specific items... I thought it was a place where folks a little better than other forums may hag about... turns out I was wrong... I joined recently and participated in threads just to be slapped at by 'interwebz tough guys with post counts' lending them pseudo authority... too damn funny... but, alas, I'm over it... you guys can have it.
toylandcruiser, you lost all cred when you interjected Bill Hewitt... It demonstrates your knowledge and understanding is off of internet accounts and not experience. that makes you dangerous to those with an interest in learning truth, and nothing more than a forum punk.... you earned it, you got it. if this offends you- good. you need to be set correct in effort to protect the reputation of the forum...
. But he is an SME. He works on more power strokes than you do. I'd be willing to take his word for it. 
