My son's E99 7.3 started having the dreaded HPOP bleed down. If he shut it down hot, the res would be empty overnight. If we filled it cold, and left it, it would bleed a little over night.
After reading every posting I could find, I dug into the truck. I purchased every gasket for the HPOP and reservoir from Ford.
I pulled the top cover, and saw the reservoir has the tube that extends to the top of the reservoir. This would mean the check ball in the block has nothing to do with the issue.
The reservoir to front cover gasket looked ok. Pulled the gear on the HPOP, and it's seal looked OK. I was expecting to find leakage into the front cover.
I topped up the reservoir part of the front cover, and it bleed down about 1" overnight.
So, I got some of that oil fluorescent dye, put about 1/2 oz into the oil in the front cover, and stirred it up. Kept adding oil to it for 4 days. Then I examined everything external with the UV light. Nothing.
Examined the HPOP input shaft seal, nothing.
Disconnected the HP oil hose at the right head, nothing.
Disconnected the HP oil hose at the left head, had dye in it!!!
Pulled off the valve cover, and found dye running down from the #8 injector.
Now to get a set of seals for the injectors on that side.

Have pix of the dye with UV light but can't post it

 

Nice work on tracking the leak. From where on #8 is it leaking? The base of the injector, which would imply the injector orings? Or from the injector oil outlet, which would mean the injector is leaking internally?

 

dieselorings.com Bob is great and will take care of you

 

Its coming from the base by the hold down bolt for the injector

 

Also found 3 of the glow plugs were bad on that bank.
Easy to change while open.

 

Great work. Very methodical troubleshooting, I'll have to take notes.

 

Hmmmm
Just checked the glowplugs on the opposite side, and 2 of those are bad (open)

Son only wants to change the 4 on the side we have open (doesn't want to pull the other cover in this rain/snow)

Yes on the diesel orings site

 

Let us know how it runs after o-ring replacements. Like to know for sure this fixed your problem.

 

Others should chime in on this, I'm not sure if having bad GP's could damage the UVCH or wiring connections on the other side. Yeah, those lower pass VC bolts are a pain, but it's not that bad.

There are lots of threads on FTE, (a few here and here), about pulling sticks and cleaning the injector cups and bolt threads. Read 'em and ask questions. You really don't want to go under there again.

 

I'm a mechanic at work, but we only have 3 PSD we work on, and haven't had to go into the injectors. (1, 7.3 E450 & 2, 6.0 E&F 450)
Our fleet has Cats, Cummins, and Detroits.

So I do have "some" tools to use

 

I just noticed you're a hop over "the hump". There are GTGs coming up, if you check-in with the forum this spring.

Make sure you hot-torque the bolts before buttoning up... this got me for a while until I figured it out.

 

photo of UV dye from # 8 injector

Kinda hard to miss, isn't it!

 

Great job! I wish my stuff went that smooth.

 

Pulled #8 tonight. Upper ring is blown out.

But, looking at it, I realized the steel ring was BETWEEN the square ring and the O-ring. No wonder it blew.

Pulled # 6 to check, and it was OK. #4 was wrong, #2 was OK.

The rings don't look like the ones I got from diesel orings.

Putting on the new rings now.

PS, #8 was so bad, I put air to the oil rail, and oil/foam sputtered out of the base of the injector. Just checking to see that it was at the base and not out the deflector

 

#8 injector

Notice the oring placement

<a href="http://s251.photobucket.com/user/yoda71/media/P2260112.jpg.html" target="_blank"><img src="http://i251.photobucket.com/albums/gg297/yoda71/P2260112.jpg" border="0" alt=" photo P2260112.jpg"/></a>

Notice twist of square oring (it is in wrong place, should have the steel on top)

<a href="http://s251.photobucket.com/user/yoda71/media/P3020116.jpg.html" target="_blank"><img src="http://i251.photobucket.com/albums/gg297/yoda71/P3020116.jpg" border="0" alt=" photo P3020116.jpg"/></a>

This is the disintegrated lower oring

<a href="http://s251.photobucket.com/user/yoda71/media/P3020117.jpg.html" target="_blank"><img src="http://i251.photobucket.com/albums/gg297/yoda71/P3020117.jpg" border="0" alt=" photo P3020117.jpg"/></a>