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?

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

It's hard to imagine how the upper harness could affect the fuel pump operation. When my fuel pumps started to go out, it sounded like there was gravel in them if you stood towards the back of the car while it was idling. It turned out only one was bad but I replaced both.

__________________
1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles