C240 203 (2000) model cut out in traffic and wont start. Changed crank sensor still no start then check fuel pressure - no pressure and pump has no power whilst cranking. Fuses are okay.Only fault in system is rear sam regarding tailamp.Only fault present is rear sam, regarding tailamp..
What next, please help.

Checking the power signal from the rear sam to the fuel pump while the engine is cranking.

Under the rear seat.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thank you M.B.DOC, the rear SAM unit is at fault, installed new unit and all is well.

Is there some connection between the tail lamp and the fuel pump?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra