Thanks for the photos!

Then some soaking overnight in kerosene, followed by more gentle cotton bud cleaning in the same direction as the wires run. Finally the crud started to break up...

First job was to clean up the contacts on the float rod arm and get them shiny again. The faces that touch the wires of the fuel level sender were in good shape at least.

I did check my water temperature sensor resistance cold and will get the engine warm tonight and check it again at temperature, believe I read somewhere that if it senses an over heating engine, it sends a signal to the L-Jet ECU to shut off the fuel pump. I also plan to take my fuel level sensor off the tank and look at the resistance of the wires powering the fuel pump.

  Have you checked your thermostat to make sure its working? Is your oil/water pump working properly? the impeller on that pump tends to rust over time and could potentially stop working.

Your motronic unit is getting readings from your water and oil temp sensors.....im guessing it might cut the engine if there is a problem with either of those....which a bad thermostat or bad oil pump would cause. Not sure if it does cur the engine on those, but would make sense that it would in order to protect the engine.

Thermostat is easy to check....drain your coolant, pull out the thermostat, check the rubber seal is in good condition, then slick the thermostat in a pot of boiling water to see if it opens up.   If it doesnt, replace it.  If it does, might need to check that oil/water pump out for wear.