Again as a professional MB mechanic, I would run a compression check first. It is quick and easy and eliminates one possibility right away. If you find no compression on the left bank, you know in a half hour what your problem. If compression is good, then you can start doing all the fuel delivery checks. The choice is yours, but I don't have time to waste, so I have to approach every diagnostic situation in an orderly fashion.

Good luck,
Peter

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