Re: Power loss (archive)

I own a 89 750il that suddendly lost power to one side and then had multiple fuel line leaks around the engine. I have spent the last two days changing hoses that are impossible to get to, but I did it. I replaced the fuel pumps last month (with used fuel pumps) do to the number(2) fuel pump not working. When this happen the last time, I discovered that the fuel line hose inside of the sender unit came off inside? Why would this happen , I ask myself? I then put in the new(used pumps) and my problems were over. A month later here we go again. Only this time I replaced one fuel pressure regulator repaired or replaced craked hoses. do you think my fuel pumps are bad again? Now the car will not even start to idle. Is there a way to test fuel pumps when they are not in the gas tank? I love the car but i am reaching my end! Help Please...

There was an E32 update campaign that should have covered you car. The fuel line that comes up through the left fender well and is connected to the short fuel hose under the coolant tank should have been replaced. Also, some of the earlier 750's had the fuel pump wiring reversed. The A wiring was to the B pump and the B wiring to the A pump.

You should use a fuel pressure guage on both banks. If the fuel pressure is either high or low, the car will not run or run correctly. Also change the fuel filters if you have not done so.

A dealer might be able to check to see if the E32 updates were performed. There might be a small round sticker in the door jam if some of those updates were performed

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