If I've decided the electric fuel pump is bad after veryfying that voltage is getting to it and the elect connections are tight i'll do one last test before replacing it. I hit it lightly with a hammer or pipe. That usually gets it going again for a while (like a starter or alternator on the fritz). It's a real crowd pleaser when you get a car running with a hammer!

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1972 450SL
1982 300D Turbo