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  1. #1
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    Member No: 67325 tigrmiller is an unknown quantity at this point tigrmiller's Avatar
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    2005 325i fuel pump and fuel tank questions

    I saw pelican parts lists a fuel pump VDO brand as OEM Supplier for about 155.00, and genuine bmw about 330.00. Anyone had any experience with the VDO, or is the "genuine bmw" worth the extra $.

    Does anyone know if there is any sensor (such as fuel pressure or anything temperature related) or electrical input to fuel pump
    that would cause a fuel pump to cycle and pulsate on and off?

    Filter and fuel was dirty orangeish looking, is there any kind of liner
    or insulation in the plastic tanks that can deteriorate and cause such
    discoloration that would require tank replacement.

    Changing filter, and fuel first then see what happens. Can a clogged
    filter cause pump to cycle on and off through some electrical circuit opening to help protect the pump?

    TIA

  2. #2
    c.d.iesel
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    nasty fuel can cause :

    ....."Filter and fuel was dirty orangeish
    looking, is there any kind of liner
    or insulation in the plastic tanks
    that can deteriorate and cause such
    discoloration that would
    require tank replacement.....?" = the tank is plastic only-
    nothing goes wrong with it (inside or out - IT'S PLASTIC)
    THE DIRTY ORANGE FUEL will cause oxidation, ruin the bearings,
    'burn' the electrical contacts in the submerged pump/sender unit,
    replace with new parts


    ....."Changing filter, and fuel first
    then see what happens. Can a clogged
    filter cause pump to cycle on and off
    through some electrical circuit opening
    to help protect the pump....?" = yes - see above

  3. #3
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    Member No: 59049 hoscarnag has a little shameless behaviour in the past hoscarnag's Avatar
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    Ever since his first post a week ago I was thinkin

    it sounds like a tank full of trashy fuel. I filled my 3.0Cs up with mud once at a BS fueling station(in order to save a few cents) and it cost me big $$$ to get it all sorted out. Never again will I buy fuel at a BS station.
    Photobucket

  4. #4
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    More fuel system questions

    Any thoughts about using VDO (OEM supplier) according to Pelican Parts, or genuine BMW ($155.00 vs >$330.00). Suspect I'll have to change pump, and Left sender also, in addition to filter. After fresh fuel, car seems to run fine for about 20 miles, then seems transfer from left to right tank stops, can hear pump running (never stops) but sounds like pump sucking air, car rpms drop, then can feel pulse of fuel from outlet hose on pump, rpm picks us. Car sits cools off, runs fine again for 15-20 miles, then same thing happens repeatedly. Besides clogged filter, bad FPR, weak pump, Is there anything tank vent purge valve related, vacuum related, expansion tank, or charcoal canister filter related that would effect transfer and limit fuel intake to fuel pump?

    If screen on bottom of pump is dirty, which it probably is, would not expect it to run fine with good acceleration, power, etc for 15-20 miles, then all of the sudden prevent sufficient fuel pick up, only to run fine again after sitting and cooling off. Thanks again for your input.

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    Member No: 19448 dembooks is an unknown quantity at this point dembooks's Avatar
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    dirt and water - gas tank - pickup strainer

    CLOGGED PUMP PICK-UP STRAINER

    remove the back seat, unscrew the pump retaining
    collar, lift the pump and look. Best to run
    the tank down to near reserve so you don't have a gasy mess

  6. #6
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    those are the exact symptoms that I experienced

    with my tank-o-mud. I had to remove the tank to get all the trash out. Twas a real mess.
    Photobucket

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    I've been meaning to ask you for a while now,

    I know you've had extensive experience with the e46, and have moved over to an e90 model a while ago. From someone with the ability to know both cars extensively, how would you compare the two? Your e90 is a lot faster, and most say the new suspension handles better. Also perhaps a better ride?
    From day to day usage, does the new car make a difference, and would you urge one to move on, or if an e46 is in great shape, would you be just as happy driving one on a regular basis?
    From any and every perspective that you might care to comment on, I'd greatly appreciate whatever you offer.

  8. #8
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    Member No: 67325 tigrmiller is an unknown quantity at this point tigrmiller's Avatar
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    VDO brand (Oem supplier) vs Genuine BMW fuel pump

    Any thoughts? Suspect I'll have to change pump, and Left sender also.
    in addition to filter. After fresh fuel, car seems to run fine for about 20 miles, then seems transfer from left to right tank stops,
    can hear pump running (never stops) but sounds like pump sucking air,
    car rpms drop, then can feel pulse of fuel from outlet hose on pump,
    rpm picks us. Car sits cools off, runs fine again for 15-20 miles, then
    same thing happens repeatedly. Besides clogged filter, bad FPR, weak pump, Is there anything tank vent purge valve related, vacuum related,
    expansion tank, or charcoal canister filter related that would effect
    transfer and limit fuel intake to fuel pump? If screen on bottom of pump
    is dirty, which it probably is, would not expect it to run fine with good acceleration, power, etc for 15-20 miles, then all of the sudden
    prevent sufficient fuel pick up, only to run fine again after sitting and cooling off. Thanks again for your input.

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