1995 BMW 318 wont start. no sark or fuel

Try testing the engine control module relay in the front power distribution box.

tried all relays, with a donar vehicle

When you trun key to run-do you hear the fuel pump prime up?

fuel pump does not prime. fuel pump relay will not energize when ignition turned on or engine turned over. but i can energize it with a power probe and get the fuel pump to run.
when ignition switched on and relay unplugged red and white wire live , green and violet to the pump negative . brown and green to ecu no feed and green to earth. when relay connected all wiring stays the same but a live feed down the brown and green wire now accurs. and relay does not energize. its as if the relay has a short but tried several relays. many thanks for your help

Check the ECU might not be energizing the FP relay-

there is no signal from ecu to fuel pump relay.
my understanding of this, is that when ignition switched on the fuel pump primes and stops then when a signal is recieved from the cranckshaft sensor
to say the engine is turning the ecu sends a signal for the pump to run, the injectors to inject and spark plugs to fire.
with this in mind i tested resistance of shielding on the cranck sensor to earth it was ok , but when i checked the centre signal wire to shieldig wire it came back 47 ohms resistance. insted of zero as the other signal wire shows. is this normal or is there a short to earth in this signal wire? and this is why i am not getting a signal to ecu?

sorry didnt meen to say no resistance with signal wire
ment to say one is 47 ohms and one has full resistance no circuit