As may be expected, the fuel pump replacement opened up a new issue. As I was operating the starter during the air bleeding process, I stopped for a moment as I was going to let the starter cool for a minute. I instantly heard a 'splatter", like someone had stepped on a ketchup packet. (best i can come up with). On inspection of the engine, there was engine oil sprayed across the top of the injection pump. Further inspection and subsequent starter operation revealed that the oil cooler had formed a substantial leak. But in operating the starter now, the oil would not spray, it would just run out.
My 'theory' is that there is a blockage down the line somewhere, and the built up pressure blew a hole in the oil cooler, maybe at a weak spot which was the 'weakest link'. That is why it sprayed the first time and then flowed slowly afterward. The next down the line is the oil filters, which according to the manual have a "bypass valve". I do not know how that bypass valve works; for instance it may be malfunctioning? Any additional experiences or theories someone wants to throw into this?
