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  1. #1
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    fuel rail pressure specs for 2005 325i

    Anyone have specs for normal fuel rail pressure 2005 325i. TIA


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    c.d.iesel
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    Re: fuel rail pressure specs for 2005 325i

    sorry - can't reach my BENTLEY manual at the moment

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    fuel pressure specs for E46

    fuel pump draw = 5 amps

    MS 42.0 and MS 43.0 = 3.5 bar (50.76 +/- 2.9 psi)

    residual pressure = >3.0 bar (>43.51 psi)



    MS S54 = 5.0 bar (72.5 +/- 2.9 psi)

    residual pressure = >4.5 bar (>65.2 psi)


    fuel pump delivery volume all models

    1.12 liter (1.16 quart) in 30 seconds

    good luck

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    Re: fuel pressure specs for E46

    Fuel pressures measured between 38-52 psi, mostly about 41-42.
    stalls, loses power, sounds like fuel problem. Last year same thing happened, changed fuel filter, and ran ok afterwards. But my stepmom
    rarely drives car, only about 200 miles in 9 months. When filter changed last nov 09, fuel looked dirty and lot of fine particulate
    matter. Also prior to changing filter in Nov 09, fuel pump fuse had blown, was replaced and hasn't blown again. mechanic I talked with
    suspects fuel pump, but says even though the gas tank is plastic,that
    it has an inner insulation lining that may have deteriorated and fuel tank may need replacing. I looked at tank level values of L and R tank, with OBC 6.0 and had 14.6L and 24.2R, Isn't it supposed to transfer
    almost all to R tank , as fuel capacity drops. Could that almost
    be a problem with clogged filter or weak pump, and not having enough
    venturi suction for proper tansfer. TIA

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    Re: fuel pressure specs for E46

    additional info. left pressure gauge connected overnight. started fine
    psi only about 31-33, tank levels showed 000 left, 33.0 right, car seems to run fine. Drove car with gauge hooked up, pressures stayed about 30-32, later dropped to 26, then up to 30. Ironically seemed to run good with good acceleration and no cutting out or stalling. tank level sensors showing varying amount 09.0 - 14.0 left, 24.0 right and it varied up and down depending on what was in the left.
    This seems awful peculiar, wonder if fuel pressure testing gauge has gone bad or maybe it is just bad gas and messed up filter causing such intermittent symptoms, that don't seem to correlate with fuel rail pressures. thanks again for any reply.

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    Re: fuel pressure specs for E46 more info

    tried a different gauge, pressure never fell below 47 psi, ever so often you could see pulsations in the rubber hose to gauge, about every 3 seconds and pressure would build 1-2 psi all the way to 64 psi. pulled
    fuel pump fuse while it was running and it ran for probably 40 seconds before it died, usually it will die in a few seconds after pulling fuse.
    Could pressure regulator be bad or some obstruction in return lines, and if obstruction what is most likely possibility? drove car around aggressively and it ran fairly well, but when idled in drive in neutral
    the gave it some gas started running bad. Seemed to run better rocking car and trying to slosh fuel. With pressure being generated seems fuel pump would be ok, When filter was changed before used Mahle-Knecht brand. Any other thoughts? thanks

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    Yes | No

    Now that you've got the specs,

    what is your motivation? Got a problem? Describe what is wrong please.

  8. #8
    c.d.iesel
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    fuel - pressure - E46 -

    use only BMW fuel filter - for quality

    the fuel pressure regulator is built
    into the filter

    look at the fuel you take out of the old filter in a
    glass jar to see what lurks in the fuel

  9. #9
    c.d.iesel
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    fuel - pressure - E46 - 2

    and one last check before you leave the old
    pump in the car -

    run a pump output volume test = 1.12 liter (1.16 quart) in 30 seconds

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    Re: Now that you've got the specs,

    stalls, loses power, sounds like fuel problem. Last year same thing happened, changed fuel filter, and ran ok afterwards. But my stepmom
    rarely drives car, only about 200 miles in 9 months. When filter changed last nov 09, fuel looked dirty and lot of fine particulate
    matter. Also prior to changing filter in Nov 09, fuel pump fuse had blown, was replaced and hasn't blown again. mechanic I talked with
    suspects fuel pump, but says even though the gas tank is plastic,that
    it has an inner insulation lining that may have deteriorated and fuel tank may need replacing. I looked at tank level values of L and R tank, with OBC 6.0 and had 14.6L and 24.2R, Isn't it supposed to transfer
    almost all to R tank , as fuel capacity drops. Could that almost
    be a problem with clogged filter or weak pump, and not having enough
    venturi suction for proper tansfer. Fuel rail pressures have been around 50psi, sometimes hose to pressure gauge would have a pulsation or thump about every 3 seconds, and the pressure would go up 1-2, to eventually 664 psi. Removed fuel pump fuse and car continues to run for about 40 seconds.This seems strange, as usually it would die in a few seconds when fuse removed.Drove car about a mile, ran fine, then started stalling, cutting out, rpm varying up and down with constant
    accelerator position. Main thoughts about it being fuel related are that 1st time it happened fuel pump fuse was blown, filter and fuse
    were changed, (fuel from filter looked bad with fine particulate matter emptied from filter), ran fine for about 200 miles, then same
    problems but has not blown fuse, and fuel rail pressures normal, and
    sometimes above normal? Maybe it's something else besides fuel system.

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    Re: fuel - pressure - E46 - 2

    Any sites or info on proper connections, hoses and electrical to perform
    fuel volume test. thanks

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    Re: fuel - pressure - E46 - 3

    go under the car to the fuel filter (behind panel -
    below drivers seat - under the car)

    catch the fuel at the OUTLET

    remove the filter anyway to dump it's
    contents into a glass jar for examination
    Blow air into the INLET end emptying
    outlet into a clear bottle

  13. #13
    oc330cic
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    Flush Out Old Gas

    Driving only 200 miles in 9 months means one tank of gas that is now 9 months old. That's waaay old. In the old days, gas that old would gum up a carburetor, requiring a rebuild. New float valve, jets, etc. I don't definitively know what it would do to modern fuel injection, but I don't like the idea at all.

    If you didn't already, empty the tank of that old gas, change the fuel filter again, and flush as much of the system as you can with fresh gas. *

    If that doesn't help, you may need to service the other parts of the fuel delivery system. You'd probably need to systematically verify every component from the injectors to the pump.

    * As always when working with fuel, be careful not to spill any, lest you accidentally start a fire. Work away from any possible ignition sources, and keep a fire extinguisher at the ready.

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    Problem solved, thanks

    removed fuel pump, pick up screen filthy. Siphoned all fuel out,
    cleaned tank inside, installed new pump, hopefully no more fuel problems. The original pump was VDO brand.

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    Problem solved ?

    hope you included a NEW under car gas filter also ?

    and I would replace the same filter again in about
    6 months / 2500 miles - crud has a habit of clinging
    to all the hiding places in the full loop circulation system

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    Re: Problem solved ?

    Yes, new filter with pressure regulator installed. Stethoscope was really helpful. Could hear that pump was running all the time, and the slurping, gurgling sounds on outlet hose when pump was starved for fuel.
    This could also be felt by feeling the outlet hose. Thanks for all of your help.

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