You started a second post where some members might not know of your first three page post.

At a minumin this pump would need a serious solvent soak.Acetone or laquar thinner. Other members have reported what comes out with the relief valve removed after the soaks. Sometimes is far from pretty. Think blobs of stuff.

In days gone by if the car had ran WVO before their purchase. You also do not want to put some of what might be in there through a set of new rebuilt injectors.

A few cans of a cleaner are nothing in my opinion as it takes some time to break down the accumulated junk deposits. I suspect they originate from animal fats in the WVO.

Boy am I negative tonite. Still there is also a reality. Most of us run from a WVO car. Usually the first job would be to totally clean out the fuel system. At least it sounds like the valves in the lift pump are not crudded up.

You may prevail and I hope you do. I just do not think it will be easy.Again I can be wrong. On a time basis I would clean out the fuel system. Then change that injection pump.If he system did not come back on line. I am also a guy that does not suggest changing out an injection pump easily.

You just pump the solvent in with the primer pump and let it sit. There is nothing in there the solvents can damage it seems. As nobody mentioned a leakage after the soaks. Sometimes it take a few soaks until what comes out of the relief valve port to look decent.

Your atf and diesel may have removed varnish from the elements as well. These are just guesses of course. Your earlier post indicates there may be an issue in the govenor section of the injection pump as well. That section is lubricated by engine oil. He could have been running polyermized oil. Far too many WVO users did no maintenance at all as it was not "free".