Like everything, I'm trying to learn more all the time about this. While I have a compression issue, it still seems to me that at the values I'm getting I should still have ignition. So, it must be something in the fuel system. I have eliminated the injectors, so it must be the IP, right?

So far, my reading up on this suggests the delivery valve as the most likely culprit. Among the many things the PO told me was that he had had the delivery valve seals replaced. I suppose it's possible one was messed up somehow. I'm at the point where perhaps it's time to bring the IP to the Midwest Fuel Injection shop.

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Chief

1991 350SD