My 2001 C320 Has no fuel supply to rail.
I swapped pump relay with another from front fuse box to check its ok.
Direct power to pump works pump and car will start and idle but not rev.
There is no power to the pump with ignition on or when cranking.
I have changed crankshaft positioning sensor.
My rear lights are always on and have been for about 4 years when the engine is running. I assume this is a fault on the rear SAM. Could this also be causing the fuel supply problem as there seems to be no demand for fuel from the electronics on the car.
Any help would be appreciated as the car is stuck on my driveway.