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Thread: Dying fuel pump?

  1. #1
    Join Date
    Sep 2006
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    533

    Default Dying fuel pump?

    I can hear a loud hum from the right rear area of my E34 when it's on. Sounds identical to the fuel pumps of the '90s full-size Chevy trucks.

    112k miles, not sure when the fuel filter was last changed but it's not the original. This summer it sat for three months driven about five times on 3/4 tank of Chevron premium.

    Think it's a fuel pump going south? I have a 550-mile drive tomorrow and don't want to get stranded!

    Help!
    Atlanta, GA/Bloomington, IN, USA

  2. #2
    Join Date
    Feb 2006
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    156

    Default

    I would really like a response to this too, because I have the same problem at first I thought it was going out but it still seems fine after about a year of noticing it, I sure as hell don't have 235 bucks for a new one.

    EAT Chip/K&N Panel Filter/Blaupunkt MP46/JBL 15" sub/Crimestopper Alarm/e38 basketweaves/Deutschland Plate/Clear Corners

  3. #3
    Join Date
    Sep 2006
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    533

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    Update:

    As far as acceleration lag, it doesn't lag any more than a heavy car with little torque and a slushbox in 100-degree heat.

    The car hasn't died (yet) but is REALLY hard to start. If it sits for more than, say, 30 minutes, it takes three cranks and furious pumping of the gas pedal.

    Still has a loud whine emanating from the right trunk area.

    Taking it into the shop tomorrow.

    One idea is that when it was in the shop in May, Dad let them do a fuel-cleaning process (which didn't involve a new fuel filter). Maybe that has something to do with it? Maybe mere coincidence...
    Atlanta, GA/Bloomington, IN, USA

  4. #4
    Join Date
    Feb 2007
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    GreenHills East-Philippines
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    checked the fuel pressure?

    HID 5000k low 3000k fogs
    dynaudio seps. mc intosh amp
    ACS w/yokohama advan sport tires
    Race logic TractionControl

  5. #5
    Join Date
    Aug 2006
    Location
    Houston
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    241

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    I found out the loud humms are bad, whines, when they get real high pitched its also bad. It is easy to get to the pump and atleast take a look at it yourself.

    I can tell you one thing, this is not what it is supposed to look like.


  6. #6
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    Feb 2007
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    Quote Originally Posted by Milkboot
    I found out the loud humms are bad, whines, when they get real high pitched its also bad. It is easy to get to the pump and atleast take a look at it yourself.

    I can tell you one thing, this is not what it is supposed to look like.

    that is EXACTLY what happened to my former fuel pump! I wonder how'd it do that to itself?

    HID 5000k low 3000k fogs
    dynaudio seps. mc intosh amp
    ACS w/yokohama advan sport tires
    Race logic TractionControl

  7. #7
    Join Date
    Sep 2006
    Posts
    533

    Default

    Wow! How do I access the pump?
    Atlanta, GA/Bloomington, IN, USA

  8. #8
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    Quote Originally Posted by Denton
    Wow! How do I access the pump?
    here you go http://bmwe34.net/e34main/maintenanc...e/FuelPump.htm

    HID 5000k low 3000k fogs
    dynaudio seps. mc intosh amp
    ACS w/yokohama advan sport tires
    Race logic TractionControl

  9. #9
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    Sep 2006
    Posts
    533

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    Thanks a ton!
    Atlanta, GA/Bloomington, IN, USA

  10. #10
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    Aug 2006
    Location
    Houston
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    BMWRP8's post is the same thing I used to get to mine, just remeber to mark the fuel lines so you know where they go when you put it all back together!

    Snakeyes and I forgot to do that and had to match up the marks made by the fuel hose clamps hahah, luckly there were two differnt kinds on there.

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