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Glad you found it! I had an MEP-016B that had a slight nick on the regulator that caused issues as well. Injection Pumps are very fine tuned machines. Digging in can be irritating, demoralizing, and make you want to toss tools. But, once you do get it. It gives you that good feeling that if...

Good find. I'm sure it can still be cleaned up. Usually they will get loose if they're worn out, not tight.

That's a frustrating one. I'm sorry. We all have one project like that. Beyond me! I'm sure, like you are guessing, it's something stupid. I wonder if at some point, an injection pump was removed improperly and the rack is ever so slightly bent, causing just enough drag & when it's hot it gets...

Have you removed the injection pumps? Do it one by one, it will be easier. I made this video to show details, though you probably know this with how much you have looked.

Just because you are getting fuel out the end of the end and back at the tank, doesn't mean the small length from the injector(s) to the T, or even the nipple in the T, doesn't have an obstruction. If you think about it, old fuel may settle in the 1 inch or so. After years, diesel will get nasty...

Seems the original poster got his machine going, but here are some things that I would have also tried for others that may find this thread down the road; -Confirm there was no obstructions in the fuel return lines from the injectors. On smaller Yanmar engines, I have seen them kinked, and...