Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Since you changed the fuel pump (a known weakness in the chassis) with those symptoms I'd go with the crank position sensor. Inexpensive part and easy enough to DIY, it typically does not throw codes when it fails.
FWIW, you're much more likely to get specific help if ypu post in the W163 forum, which focuses on your chassis.
Good luck, see you in the 163 forum.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)