[Stonewall]

Well, that would make sense, except you forgot an important fact. The man who invented the diesel engine and who deisel was named for, Rudolph Diesel, wasn't English; he was German. I speak some German (very similar to English), and the "s" in German has the same sound as it does in English. I have met a few Germans, and they also pronounced it this way. So what you're saying pretty much is that "diezel" is just a bastardized British pronounciation of a German name.