I just had the classic ignition failure - when I shut off the car, it continues to run until I pop the hood and shut it off manually. At the same time I believe it happened, I was driving and my A/C suddenly stopped coming from the center dash vents and went to the defroster vents - also a sign of vaccuum failure, I think.

I took it to my mechanic and after he showed me the vaccum line cap covered in black oil (I'm not sure whether it's motor oil, diesel, or WVO) he said that the air/vaccuum pump diaphragm has failed and is leaking into the vaccuum lines. He told me to go get a new pump diaphragm and he will install it for me and clean out the vacuum lines to the ignition.

Does this sound like an accurate diagnosis and solution? If so, where would be the best place to get the necessary diaphragm?

Thanks for the help!

__________________
Autos:
1991 350SD 276,000 miles
2001 VW Beetle TDI 115,000 miles

Horns:
1955 Selmer Mark VI Alto (55,xxx)
1958 Selmer Mark VI Tenor (85,xxx)
1964 Selmer Mark VI Tenor (125,xxx)
1967 King Super-20 Tenor (430,xxx)
2002 Selmer Series III Soprano

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