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Oh yeah
NOW I REMEMBER!!!!!
I have a 530i(V8) Bimmer wagon and it was doing EXACTLY what you describe. It would not run on its own, but I could drive it only if I "power braked" it. Yeah that right.....So on the Bimmer forum(roadfly), I read that the fuel pump was a culprit for this particular affliction. I replaced it and sure 'nough, that's what it was. I know you did the fuel pump"hum test" It may hum and it may be sending SOME, just not enough. These V8's LOVE fuel.
If you have not already done so, check your fuel pump by using a pressure tester OR by either disconnecting the sending line at pump attaching a piece of extension hose and having someone else turn the ignition on and observing whether it barely or REALLY flows out, And OR by disconnectiong the fuel pressure regulator(it might be the culperet as well) located on the Dr. side fuel rail on the engine and again verifying whether or not a LOT of fuel comes out, the pump may be okay but check it anyway by turning the key on briefly. (CAUTION) Do whatever you think is best to direct the fuel in a safe direction. I'm not looking at the car but maybe you can place it inside of a short piece of water hose or old radiator hose. If the fuel pump is good, that fuel out to shoot out like crazy. If its barely or comes out in a weak stream....there's your culprit.
(PLEASE BE CAREFUL COVER ALL ELECTRONICS. YOU DO NOT WANT TO GET A SPARK ) Or its Bye, Bye Baby
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