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Topic Review (Newest First)

  • 02-04-2009, 04:31 PM

    Pulse sensor if no fule pump realy pull in

    If you don't see fuel when cranking ( using info from previous posts) you can bypass fuel pump relay with a jumper to test from relay socket back. I think shogun or Sean has a link on his site. If that works you could have a bad crankshaft pulse sensor. It plugs into main harness and sensor head detects crankshaft pulley rotation and to pull in the fuel pump relay. This sensor can go out all at once or sometimes not pull in at low RPMs but trick you all is okay until you stop. then no start. I think if you look hard they run around $55 to $75. You can also do a resistance check on the sensor to get an indication is its faulty. My BMW mechanic buddy always keeps a used spare one around to quickly trouble shoot things like this. I borrowed his to keep driving until my new one arrived. that was at maybe 230K mark. Good luck ! KenKen

    92-BMW 735iL
    74-Widebody Porsche 911S
    81-VW Caddy
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  • 01-13-2009, 06:46 PM

    Or check fuel flow

    You can disconnect the fuel hose at the firewall and extend the hose into a glass bottle. Then if fuel pump is good, as you crank the engine fuel should run into the bottle. You can also use a T-adapter and fuel pressure gauge ($35 ish). That way you can positively know that the pump/regulator are working in concert.Patrick C 88 750 159K
  • 01-11-2009, 04:49 PM

    Re: E32 Died

    Just had the EXACT same thing happen. 237,000 miles. Will not start, no noise from pump, etc. Does anyone have a voltage test or pinout diagram so I can test voltage at the fuel feed connector?
  • 01-10-2009, 01:20 PM

    generally the fuel pumps are quiet

    in general, if they start making noise then it is probably time to change them. You cannot hear them when the engine is running. Needs bridging thefuel pump relays. Or someone listens at the rear end when you switch ignition on. When you switch ignition on without starting the engine, the fuel pumps start working till they have made enough pressure in the fuel pressure line which is required that engine can start. That is usually (when the check valve in the tank is fine) just 1-2 seconds, when check valve in tank is not good, and the car has stood for example over night, it might take some seconds.
    Or you use long cables from the engine room B+ and ground and give directly power to the connections inside the trunk.(or from a jump starter)
    Easiest is the fuel pump relay jumping, see Johan's website, link is on my website below under DIY links private.Shogun E32 Tech Tips:
  • 01-09-2009, 11:02 PM

    Re: check the voltage

    Thanks,will check them. But the starter still turns over splendid and all accessories are in working order.Voltage appears fine.Am a bit under the weather right now,but will check the links.should the fuel pumps whine or make noise you can hear from the cab?Trying to fix,but do not have extra ears.Is there a safe way to "jump" the fuel pump as I am working by myself and cannot have my hand on the ignition and in the boot at the same time?
  • 01-08-2009, 09:07 AM

    check the voltage

    on the battery, then check the voltage in the engine room, I assume the fusible link is broken or has a haircrack. These pics are from the E34, but similar. In case of the E32 the fusible link is under the rear seat passenger side left hand drive, there is one black box behind the battery, there is the first one, the second one is in the line from the battery to the front into the engine room. Follow the battery cable, you cannot see it, but you will feel it in shrinked plastic.
    click here E32 Tech Tips:
  • 01-07-2009, 05:05 PM

    E32 Died

    Please help, looked through archives and found nothing that would help.(M30 12/88 735i 247,343 miles)Ran beautiful after some tlc. Then after driving for several much enjoyed months where it ran fine,died for no reason,was running great then just stopped running while driving.No sputter no lag just quit.Have no fault code from ECM,3/4 tank of fuel and have spark.Changed relay to fuel pump and checked fuse,both good.Cannot here pump running(by myself)but never heard it whine or make any noise as American vehicles do. Any help would be appreciated. Have used this forum for many fixes on the old bird(still a newbie)and hope you could help.Bentley's is not.
    Thanks in advance!

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