Hello,
I have a 1975 240d(w115) that ran when parked in a barn in 1996 and now I am trying to get some signs of life. I've gone through the "venting injection system" protocol, but the IP seems to be dead. Some posts I've read elude to the fact that it may take a lot of turning over to purge air and what not.
I have also read about replacing a diaphragm, but I don't know what problem requires that remedy. The motor has around 80,000 miles. Are there some troubleshooting procedures out there? Thanks.

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1975 240d