PROBLEM SOLVED- Excessive Cranking and Fuel line grinding/humming noise

I have a 2005 760 with 49k Miles. All my problems started about 2 weeks ago when I completely ran out of gas. I was cruising on one of those ‘remote’ freeways with gas stations about 80 miles apart and it so happened that I never made it to the next gas station which was exactly a mile away.
Anyway, here are my symptoms that started the following morning;
1. Random excessive cranking (about 6-10 seconds). Mostly during cold start up and sometimes after the car has been running for a while then letting it sit for like 30 minutes.
2. There is loud grinding/humming noise emerging along the driver side of the car upon starting when engine is cold. Then it goes away as soon as the engine warms up. It sounds like the fuel line to me but I could be wrong.
3. I had a couple of PENDING check engine light codes (random cylinder misfires) but they all cleared up by themselves.
4. My RPM sometimes slightly goes up and down when I’m stationary but this happens very rarely.

Yesterday, I replaced the in-tank fuel pump (passenger rear) but I am still getting the symptoms. Then today for the first time, the car stalled and died on me with about 30 more miles range left. I filled it up to about half a tank, and it started right up. I’ve been driving it since and haven’t experienced any stalling/dying problems again.
Do you think I need to replace the fuel filter/pressure regulator as well? Any ideas what you think might have happened to my car? Thank you.

I replaced the Fuel filter with Pressure regulator. All my problems solved......

Also, I realized that the in-tank fuel pump that I had before replacing with the new one the other day was only a year old. The previous owner must have replaced it before. Anyway, I have an extra fuel pump. If anyone is interested, just let me know. I'm selling it for only $250...We can do a paypal transaction.

Just out of interest, with the engine idling and the hood up, how much vibration do you get when resting your hands on either side of the engine (just above the air intakes for example)

looks like Im to late but yea when ever u run out of gas, you must change the fuel filter, you suck up all the junk in the bottom of the tank, and especially with a 760 you need a free flow of gas!!!

Does this have the in tank filter or is it inline under the car?

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Originally Posted by Mr_Burger

Just out of interest, with the engine idling and the hood up, how much vibration do you get when resting your hands on either side of the engine (just above the air intakes for example)

Nope.. No vibrations at all.

Nope. No vibrations at all.

Originally Posted by pauliehcfr

Does this have the in tank filter or is it inline under the car?

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Paul,
It is the inline filter. Right behind the front driver wheel. Very easy DIY.....And by the way, I performed an autopsy on the old fuel filter. Man, its all dark and nasty.....Can't believe it.

I purchased this car from a dealer in Houston after running CarFax, AutoCheck, and a National VIN search. The 760 was shipped to me this past Monday and received Wednesday evening. I have driven the car less than 50 miles since it was pulled off of the delivery truck. Mileage is now at 89,996.

The car ran great the first night I owned it and I drove it about 6 miles just to make a test. Next morning while making a right turn in a parking lot the car stalled. I was able to immediately restart the engine. I drove 6.5 miles to my home immediately after this event and while idling the car in my driveway it died again. I restarted and it idled cleaning for a long time. I made a late afternoon run to the US Post Office without a problem. I followed that by driving 2 miles to fill the fuel tank without any stalling issue.

Last evening, day three of ownership, while driving to dinner the car tried to stall again, idle surged, dropped back down to normal, I proceeded. Few minutes later car tried to stall again, idle surged, and this time the check engine light came on and has stayed on.

I got on this forum to look for similar occurrences and found this thread:

http://www.bimmerfest.com/forums/sho...629&highlight=


I have a local mechanic that does the work on all of my vehicles. I have owned a 528, 733, Z3 2.8, Z4, and a 750iL. I have familiarity with the BMW brand and believe they are the best vehicles to own.

What is the best course of action here? I had a 750iL for 7 years and never had a problem with it. I expected the normal V12 to be at least as reliable as my old one.

Originally Posted by pkathee

I replaced the Fuel filter with Pressure regulator. All my problems solved......

Also, I realized that the in-tank fuel pump that I had before replacing with the new one the other day was only a year old. The previous owner must have replaced it before. Anyway, I have an extra fuel pump. If anyone is interested, just let me know. I'm selling it for only $250...We can do a paypal transaction.

I am going to go home and look it up in the manual, but just curious where it sits and what you discovered when replacing it that would help others? Pictures would be awesome

Originally Posted by mws

I am going to go home and look it up in the manual, but just curious where it sits and what you discovered when replacing it that would help others? Pictures would be awesome

have what sounds like the exact same issues. Mine started after I installed K&N drop-in waffle filters in the airboxes, but mainly, once I started modifying my exhaust. When the engine is cold, it can take as much as 10 seconds to start after cranking. Also, after a minute, once it goes into closed loop mode, bumps and runs rough, sometimes dies-- until the tach says it's fully warm. Then it starts and runs perfectly.

did the replacement of the inline fuel filter and regulator as well. Did not help my problem, unfortunately.

Running the tank dry should be avoided at all times. The pumps are fuel cooled and lubricated. Especially the 760's as you don't want to run the risk of damaging the high pressure fuel pumps. Also, the in tank pumps pull from the bottom of the tank all the time. So the only way they suck up trash when run to empty is if the trash is floating on the surface of the fuel. Also, the fuel is pulled from a "well" or "can" in the tank to prevent the gauge from fluctuating as the fuel sloshes around in the tank. The "well" has a small opening in the bottom to allow fuel to enter slowly. Just FYI.