injector return hose popped off

[vmb]

The only cause for excessive pressure in hoses between the injectors would be a restriction in the return banjo or line to the tank. 

Try blowing (compressed air) through the return line.    Unlikely there is any trash in the return line but the metal tubing or rubber hoses could be damaged. 
The injector return lines first have to pass through the banjo fitting on the IP out bolt,  unlikely it has any blockage but you can easily (but carefully) take it off and look at it.

I'll give the compressed air a try. If I'm feeling ambitious tomorrow, I'll also take a look at that banjo fitting. Any idea what diameter those washers are? Just to make it easier to go look for some.
I have noticed bubbles in the return lines between injectors since I started using the Tygon stuff. The hose that was on the #3 injector had come loose, almost seemed as if it was stretched, possibly due to temp changes. I put some new stuff on and made sure to get them on the injector nice and tight. I take it there really shouldn't be too much air in the return lines, doesn't seem like a good thing to have. Unless you were referring to air intrusion in the lines to the pump.

[libbydiesel]

There is always air at the tops of the hoses between the injectors.  The injectors do not flow enough fuel through those lines to purge that air.  The issue to watch out for is when you shut down and bubbles flow in those lines toward the return banjo.

[vmb]

Ok, I'll keep an eye out for that. Air in lines is normal, unless the bubbles flow towards the banjo after shutting off.. I'll take a look at what all of that is doing.

[vmb]

Well, only seeing bubbles in the lines at and around the tops, so that sees ok. When the engine is shut off, they don't seem to move at all, unless you fiddle with the lines themselves, as expected.
So that all looks fine as far as I can tell. I was looking at the line that had popped off, the end that was on the nozzle looked like it had stretched out. When it was warm, it seemed loose on the injector itself, IE you could easily pull it back some. Perhaps it's just getting too hot and slipping off? Are the injectors supposed to get rather warm? I assume that's what the heatsink that sits between the injector and the block would prevent that.

[fatmobile]

Try blowing through the line going back to the tank.
 See how hard it is to do so.
 There is a check valve in the return line,.. near the tank pickup, just outside the tank if I remember right.
The one in the supply line cloggs so the one in the return line might too.

Remember to remove the fuel cap if you are going to shove compressed air into the tank.

[libbydiesel]

The injectors will get as hot as the head casting. 

[vmb]

I figured as much.
Running the engine and just letting it idle, I'm seeing fuel on the injectors. Can't really tell, but it almost looks like it's coming from the area around the return nozzles, as if fuel is seeping out of the hoses. Though, at the same time, it also seems like it could be coming from the point where the injector halves meet. Only seems to be happening on 3 of the injectors, so maybe it's an issue with the injectors themselves. I'll see about replacing them soon.

Try blowing through the line going back to the tank.
 See how hard it is to do so.
 There is a check valve in the return line,.. near the tank pickup, just outside the tank if I remember right.
The one in the supply line cloggs so the one in the return line might too.

Remember to remove the fuel cap if you are going to shove compressed air into the tank.

I'll give this a try and the compressed air as well. Also, I'll check out that check valve. I think I remember seeing it on the diagrams in the bentley manual.