I've been thru this - '91 300-SEL.

Car started fine in the morning - then after 10-15 miles of driving stalleds/died.

Turned out to be a bad fuel pump.

While replacing that - I changed out everything related to fuel near the pump. Accumulator - hoses - filter - tank screen - etc.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"