no mpg in the 100s that I'm aware of.
Ok i'm satisfied about your air-in-fuel prevention, although very concerned about unfiltered fuel to cp3 and injectors. They are FAR less tolerant than your Mercedes.
Have you checked the injector fuse and relay in the PDC by the battery? Probably good, as you say it continues to run on diesel once it fires on gas.
Weird, that once it fires on gas fumes, it continues to run and drive fine. That being the case, means there is no problem with the injectors, electrical otherwise. This indicates they are being prevented from injecting while cranking due to lack of rail fuel pressure rather than electrical message.
I suggest replacing the CKP (Crankshaft position) sensor, and the CMP (Camshaft position sensor) either has the ability to cause weird starting and dying behaviour. They are really much easier and faster to replace than to try to troubleshoot, and aren't all that expensive. Besides, they are reaching the age where they seem to go bad anyways.
If that doesn't fix the problem, the next most likely would be a sticking Fuel Pressure (relief) Solenoid at the back of the rail, hope it gets fixed before you get to this, because that's a whole greater realm or 2 of PITA to change, and they are expensive. Unfortunately I presently, from your description, believe this will be your culprit, but hope that the less expensive sensors might fix it.
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