BMW Repair: 88 325is NO FUEL & NO SPARK, empty tank, dead battery

Question
what causes this condition?

Answer
I'll assume you mean besides empty tank and dead battery.....

Can I also assume the engine turns over fine?  Did the engine just stop?  Or has this car been sitting for a long time?

Fuel:  Start with the pump.  Is it getting power?  If so, is it pumping?  If so, check the fuel filter.  

Spark:  Battery good?  Ignition wires good?

Not very familiar with these e30s.  Might be a fuse that shuts down everything.....Always a good idea on issues like this to check EVERY fuse.

Let me know more about it, and I'll try to help further.