My 1993 325i has just developed starting problems.
It will almost start but won't. To me it seems like a fuel problem so I started to look in that direction.
I have found that the fuel pump relay is not operating. 12v is present on the primary winding when the key is on but no earth is present on the primary winding so the relay does not energise.
I have manually operated the relay (by removing the cover) and I can hear the fuel pump operate but when the engine is turned over it still will not start.
Tracing the primary side of the relay that should have an earth on it, it goes into an ecu of some sort.
The Haynes manual doesn't have a circuit diagram that shows the fuel pump circuit so I am stuck.
Any help greatly appreciated.