I don't know the Motronic system too well but in the L-jet system, the fuel pump power is controlled by a relay. The relay gets a signal from the coil that the ignition system is firing then it powers on the pumps. So, if you are certain there is spark, I suggest you check the relay (guessing it is located next to the computer behind the right side seat) and double check any fuses (L-jet has an in-line fuse next to the computer for the fuel pumps). Sometimes a reluctant relay can be jolted into working by giving it a rap with a screwdiver handle.
Also, the L-jet doesn't wake up if the voltage drops below about 10.3 Volts. And that is possible during cranking - the engine will sound like it is cranking over OK but if there ain't enough juice left for the computer = no go.
If anyone with more knowledge of the Motronic system chimes in, listen to them as I am mostly guessing & assuming...
Also, the L-jet doesn't wake up if the voltage drops below about 10.3 Volts. And that is possible during cranking - the engine will sound like it is cranking over OK but if there ain't enough juice left for the computer = no go.
If anyone with more knowledge of the Motronic system chimes in, listen to them as I am mostly guessing & assuming...