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I think you may have nailed it. I do have a 3GMF. The last time I looked over the heat exchanger I ran some welding rods thru it. It looked pretty clean. That was about 175 hours back. I'll check out that exhaust elbow. I may have overfilled the oil level bit when I was topping up after 26 hours of motoring. Do you think this could have affected the fuel pump diaphragm? I found it curious that when I went to top up after another 10 hours engine time that the oil level was just above full.
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