My 400E is hard to start now that it's cold outside. One thing I notice is the fuel pump only runs for a very short time on cold start. I replaced my upper harness and am tuned up. Then today I got in the car and it started right up!?? Anybody having the fuel pump symptom like mine?

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out