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I've got a 1990 740gl. It seems the main fuel pump died last week, so I swapped on another unit. After swapping the fuel pump, the car still does not run. I get fuel to the injectors, I swapped spark plugs and get good spark, and even swapped in new injectors, but the car still does not run. Also swapped fuel pump relay with a working one, and checked all fuses. I also swapped ECU's with a working ECU. I swapped the radio suppression relay as well as the ignition module. In-tank pump seems to work. I added a button to the cold start injector and the car will run temporarily on the cold start injector, as long as the button is depressed, but it will not run once I let it go. This is driving me insane. Anyone know of anything I may have missed or glossed over?
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