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I was told by a bmw tech that I autocross with that the pumps fail due to the corrosion of the internals caused by gas additives. I live in San Diego, like the original poster, but I didn't have to replace yet at 20K miles. I do have long starts though. I will replace it soon. I think it's strange as well how some have issues and others do not. I use Shell Vpower 91 octane EVERY time. How about other people? Could it be the gas?
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