i worked on my buddy's '88 300CE and replaced both of the check valves (two fuel pumps) as part of a big round of service right after he purchased the car. on occasion the car will still die immediately after you start it cold, first start of the day. it will start and run perfectly the second time. it seems a bit random when it happens. i suggested he prime it a few times before starting and report if this cures the immediate stall issue, no report back yet however. but i would have expected the new check valves would prevent this issue from ever happening but it didn't seem to completely eliminate it.

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punkinfair