if your plunger isnt moving, or rotating, you have bigger issues than we can sit on the interwebs and diagnose..
you either have a snapped plunger, or like you were saying, the rubber dampers have deteriorated, and wont do their job anymore..
time to take the pump off, and open it up..
I have had the same happen to me, twice! Once the plunger seized in the head and caused the litlle index pin on the cam plate that drives the plunger to shear.
The other time the fuel regulating collar on the plunger shaft seized to the shaft, shearing off the pin that fits in the collar on the throttle arm. Both times were caused by bad fuel (veg oil)and/or corrosion and gunk from long storage.
I think it is time for a pump tear down.
Michiel
Disassembled the pump and found this inside:

Notice the metal fragments clinging to the inside. The rollers were falling out after just taking the cover off. Also notice how much corrosion was inside. This was an original pump but supposedly resealed. By the looks of it, the pump probably sat up and rusted for quite some time.

Looks like I'll be shelling out for a new injection pump.
Thanks to everyone for the comments.
I wouldn't send it anywhere.
Looks like its already been to Hellenbach.
And might should have stayed there.
A guy on Vortex has an almost brand new pro rebuilt (stock) NA Altitude pump for very reasonable. Believe he has receipt to document. Looks full legit. Think he will include the lines and injectors also. You'd need the lines if going on a Std NA.
He seems VERY motivated.
And there is a placed called Hans/WestPort - in NC that has good prices on rebuilt pumps.
LoL sorry
I wouldn't send it anywhere.
Looks like its already been to Hellenbach.
And might should have stayed there.
A guy on Vortex has an almost brand new pro rebuilt (stock) NA Altitude pump for very reasonable. Believe he has receipt to document. Looks full legit. Think he will include the lines and injectors also. You'd need the lines if going on a Std NA.
He seems VERY motivated.
And there is a placed called Hans/WestPort - in NC that has good prices on rebuilt pumps.
LoL sorry
LMFAO!!
that right there made me giggle!
-Thats not rust in the pump. It is polymerized veg oil. same as the coating you get on your cast iron frying pans when you cure them.
-might be what caused the piston to sieze and the anciliary damage.
I have been mainlining diesel clean every oil change in hopes it will keep the insides of the pump cleaner and stop the build-up. I hope it works!
Michiel
i, for one, dont run anything besides bio-D, or regular D (treated with lubrication or cetane booster of some sort, of course) in my car.. ive had to deal with a car that got vegi'd to death..
YES!!
they can, and will die from vegi oil if you dont run it exactly proper..
if you start a cold diesel on vegi, it will coke the rings up in no time, and quit starting all together!