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I would not even bother pulling the injector at this point if you are getting white smoke coming out the intake. I would check valve seating , timing, and adjustment. Of course, doesn't hurt to do it all.

It has been a while since I worked on one of these, but if I remember, the bypass is before anything gets into the pump... the extra that goes back to the tank just does a 90deg turn or something. So, it would lead me to belive there is not enough fuel getting there. Air trapped in the line...

I took as much of the pump apart from the top as I could and let the ATF soak in there and put heat in there as well as well as around it to help the ATF really get in there. It took doing it a few times a day over 3 days or so to get it to finally loosen up enough. Feels like this was kind of a...

https://www.steelsoldiers.com/threads/mep-016b-injection-pump-jammed.201667/

That was my thread you referenced above. I have since sold that MEP-016B, but it was running like a new machine when it went. Just take your time cleaning everything and putting to back together. There are some videos out there on these pumps that show them getting put together. Yes, they are...