On the 240 I bought, it was leaking also. I decided to replace with a black one. The PO had wrapped teflon tape around the threads in an attempt to stop leak, didn't work. He also was using bio-diesel. I'm convinced that destroyed internal parts of primer. All the info I've read on the subject, mentions to use old style if using bio. I do not on any the MBZ (five) I've owned. Have replaced all with the new black style, with copper crush ring, no problems since. I pulled the one, minus crush ring, out of my current basket case. New they run about $20.00.

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83 SD

84 CD