More IP pump woes...

[kibs45]

So I tore down my first failed pump, and suprise suprise I can't find anything significantly wrong.  A little background would be helpful I guess.  I had a IP rebuilt six months or so ago and put very few miles on it.  Well a couple of weeks ago the high pressure side failed.  I was getting fuel into the pump and back out but just a dribble out the pressure ports.  Well I switched pumps, and thats a whole other story.  Anyway I pull this one apart after talking to a diesel pump repair place (bosch certified)  they said it sounded like a plunger spring broke.  Alas the pump is apart and nothing appears wrong, I am however suprised by how dirty some of the parts look and there appears to be more solid "grease" in spots.  Are there any particular fuel ports that would be succeptable to blockage I should be looking at?
1.6 NA
Thanks for all the help.

[Smokey Eddy]

Sort of a rule of thumb i've always read and followed with the IP's is that the inside has to be surgically clean. I don't fully inderstand all the parts inside other than what i can discern from diagrams and how the pump actually build pressure. It's a standard hydraulic pump really but it has all sorts of springs and crap to make it disperse at very precise times. I'd try cleaning it all up as best you can, put it back together, put the feed tube in a cup of diesel and spin it with a wrench, wait till its full of diesel and see if diesel comes rocketing out?

However!
someone who knows what they are talking about may be more helpful.  but there is no harm in making things clean and just testing it viced to a table. Make sure you dont be anywhere near the outputs

[autoholic]

Pay close attention to the rotor head asm and shaft, there are small passages in there which may clog (?), or maybe the rotor shaft is not spinning for some reason?. I had a similar situation with a friends pump, the low psi side worked fine but it just would not pump high psi.
I rebuilt the pump and used a new rotor head and it works fine, but I still do not know exactly what was wrong with it.

[kibs45]

Yeah it seems kind of odd, the assembly seems to rotate just fine so I kind of figure it something in the head...thanks for the help.