Powerstroke HPOP Prime?

[cragenj3]

1996 F350 7.3 psd zf5 4x4
Efuel, mle1, new ipr, icp, ebps, map, cps, tps, nss, hpop, injectors,

I bought a truck in pieces and been putting it back together.

It runs, it boosts, I don't have any oil or fuel leaks.

However, I have 10 second crank times.
If I pull the lines at the heads, cap one, and gauge the other I build pressure after 10 seconds...but at KO I lose it all.
I literally can't drive the thing anywhere because 10 seconds of cranking is too much cranking.

HPOP is eBay off a working truck, IPR is eBay off a different working truck (is OEM, not an Amazon/Chinese knockoff), it can't be bleeding at the injectors because it's deadheaded.
That only leaves a hairline crack in the front cover, right? The check ball valve and seat under the hpop near the driver side head is a LPO check ball it can't be bleeding HPO, and my HPOP reservoir stays full anyway.

What are my options here... Replacing the front cover for diagnostic purposes is tough to commit to.. but my HPOP and IPR are "working" from eBay, the antidrain back would take the reservoir, not the high pressure side, obviously HPOP base gasket is new,

I'm tempted to hotwire the IPR so it stays live overnight so I don't have 10-15 second crank times.. need a real solution, help please.

 

[Black dawg]

What does the scan tool show for hpop pressure during that 10 second crank?

It does this regardless of how long it has been shut off?

How far have you driven it?

 

[Black dawg]

This is how they act when there is still air in the system, have you driven it very far?

 

[cragenj3]

No, maybe 2 miles, but I tried some hard accelerations, probably 6 or 8 of em to no avail. I figured if it runs air gotta be out, then figured 6 or 8 oughta do it.

Scared to drive it, lol and holy hell it's slow; like 0-60 in 10 seconds, almost runs like a 2stroke, you got no boost to 1800 then 0-10 from 18 to 2400. Can't get it past 10/11/12.

I guess I'll drive it...I'ma be up in 911 Diesel Down post from the side of the road tomorrow.

 

[lotzagoodstuff]

As Black Dog commented, have you watched the HPOP pressure as you drive it vs when you are cranking it? Forscan is free and could help you.

Last question: what kind of oil and when was it changed last? In addition to not getting all the air out, any foaming of oil makes for a hard start on a 7.3 PSD.

 

[Black dawg]

No, maybe 2 miles, but I tried some hard accelerations, probably 6 or 8 of em to no avail. I figured if it runs air gotta be out, then figured 6 or 8 oughta do it.

Scared to drive it, lol and holy hell it's slow; like 0-60 in 10 seconds, almost runs like a 2stroke, you got no boost to 1800 then 0-10 from 18 to 2400. Can't get it past 10/11/12.

I guess I'll drive it...I'ma be up in 911 Diesel Down post from the side of the road tomorrow.

Usually takes much more than 2 miles. Warm it up good, take it on a 10 mile round trip with some wot. It will fix it.

 

[Black dawg]

They will run perfectly other than the extended crank until the air is worked out.

 

[cragenj3]

Haven't watched oil pressure while driving, haven't used forscan while driving.

Oil is either rotella t4 or t6, whichever was cheaper at the time, and less than 10miles on the oil and filter.

It does run fine, it just loses prime... I figured it's an internal leak but I guess it would make sense that if it's got an air pocket it could let hpo drain out/back but still function otherwise.

 

[trackspeeder]

You need more than 10 miles of aggressive driving. Usually around 30 will do it. Don't rule out injector O rings.

 

[Black dawg]

I have a 10 mile test drive that I take them on that has never failed to get them to start normal, but yes, more miles wont hurt, especially if it is cool/cold out.