Car is 1989 300E. Engine was tired so transplanted a 115K 1993 2.6 from a 190E. 300E ran great before swap, just used and leaked oil like it was a good idea. 190 was running but wrecked. (Let me pause here to reflect on the fact that it is clear that the Benz designers did NOT have engine R & R in mind when they designed this car. A pox on them and may their testicles, if any, be crushed in a white-hot vise.)
Anyway, the car showed no signs of life at first then was coaxed to life with generous throttle application. It now will start almost instantly, dies within 2 seconds but will restart immediately thus repeating the cycle. The chassis electrics are the last thing I'd suspect since the car started and ran so well prior to the swap. The engine came with all it's various and sundry sensors, complete fuel injection system, senders and the like.
Any thoughts? My limited knowledge points me toward the fuel system, but where? I did a search but grew weary as none of the ones I viewed seemed to address my specific problem.
As a side note, I will be attempting to sell the 300E engine in part or whole. 255K with everything working but probably a bad head gasket or in need of head work in general. I thought the engine swap would be cheaper and easier than the head rework. Hmf.....
Thanks to all.
Chuck.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".