[Hydro]

How much force did you use when installing that IPR? -- I mean, it should slip in with only a little force as the oring slides in the bore

 

[Hydro]

The part of the old IPR should have threads protruding from the pump housing -- does yours?

 

[Hydro]

Righty tighty - Lefty loosey

Just unscrew the the part out of the pump housing -- could have put the old one back together, but not now

It is not uncommon for the top part of an IPR to come loose -- should have has a little blue loctite on those threads when it was assembled, so it would not separate, but stuff happens .

 

[Hydro]

I think that would push the part deeper -- can you use needle nose vice grips in there?

Yeah I forgot about the 7.3 IPR being made differently -- the later valve has the threads only on the main body (and would still stick out the hole)

 

[Hydro]

If the internal valve and spring are out -- you could fashion a wire with a sharp 90* bend to hook into one of the holes on the body -- coat hanger is good wire to use

 

[Hydro]

Tap a tapered punch in the valve hole, and crank the engine over -- the pressure will blow the part out
Gotta choose a punch that fits the hole, to make the seal

 

[Hydro]

Glad you got it out -- I can see the red loctite in the threads from your pictures -- curious as to what caused it to loosen off

Personally I would pop the oring off and push the part back in the bore -- it should slide in with no resistance

Stick a mechanics magnet in the hole and "fish" out any metal particles that way