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Frequent buzzing sound from W124

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Waft, Oct 18, 2012.

  1. Waft

    Waft Senior Member

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    Joined:
    Apr 5, 2012
    Location:
    Cambridgeshire
    Your Mercedes:
    1993 E220 Sportline Coupe
    Hi!

    On my 93 W124 E220 Coupe,I have an a frequent humming/buzzing sound coming from the rear.I notice this mainly upon start up.

    I have run her onto the warning light on the fuel gauge many a time.I did recently change the fuel filter with an OEM one,and also the pipe from the tank to the filter which sheared at the union.

    My concerns are over the difficulty of changing the in-tank filter,if this has one.I think these cars have an one there which is high pressure.Also the Bosch coily shaped one next to the filter.Is this right?
    I'm kind of excited if the external one is knackered,as I could fit an Bosch 044 one as I did to my Audi 200 Turbo.Held a good steady,and higher constant pressure.The job on the in-tank pump on that car left me stoned and confused for the next few hours.....maaaan! :rolleyes::shock:

    TIA

    Steve:D
     
  2. huey

    huey Senior Member

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    Location:
    Nottinghamshire
    Your Mercedes:
    W203 cdi 2004 Estate
    Hi, if it is most noticed on start up then yes it is the fuel pump, I don't think your car has an in tank filter, although someone will correct me if I'm wrong:D Just a thought You did say that you sheered a union, is the union leaking as it may make the pump work more?
    You are correct the fuel pump is next to the filter . Hope this helps
     
    Last edited: Oct 19, 2012
  3. OP
    Waft

    Waft Senior Member

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    Your Mercedes:
    1993 E220 Sportline Coupe
    .

    Hi Mark!

    Hey thanks for that.

    I hope there is just the one pump.

    I did replace that hose mate.It was the alloy which they clamp/bond to the hose.It had failed,and I had probably twisted the hose upon loosening the fuel filter in all honesty.

    Looking forward to someone posting up how many pumps I have!:D
    Really can't be doing with getting stoned in the boot again.Funny on the day,mass headache the next day.Just say no!:p

    ;)
     
  4. robparker

    robparker Senior Member Authorised Forum Supporter

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    Your Mercedes:
    C55 (203), 220d (115), 200d (110)
    You definately only have the 1 pump under the car by the filter
     
  5. OP
    Waft

    Waft Senior Member

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    Back of the net!

    Awesome,thanks Rob!:D
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Did you fit the in line filter the right way round, the arrow indicates the direction of the flow and it often points towards the rear
     
  7. wireman

    wireman Senior Member

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    Your Mercedes:
    nice 201 2.5D 1993 & very nice 129 SL500 1994
    There is a tank strainer at least on the US model and my diesel, it is screwed into the tank from beneath at the centre, the pipe to the pump comes from it. A large rubber seal/grommet covers up the strainers nut.

    If you do have a go at the strainer make sure the tank is empty before you take the thing out, a severely chocked strainer will hold a gallon or two of petrol back and this will gladly fall out as the strainer is removed.

    You should remove the rubber seal and hold the strainer whilst the pipe union is unscrewed, the strainer might undo before the pipe if you don't and that makes a big mess if there is any fuel in the tank.

    Don't go there if you don't need to.

    One symptom of a choked strainer is that the "reserve" warning may only give a few miles warning and when refilling from empty (running out) it only takes 55-60 litres, it should swallow 70. I got 2 miles warning and ran out entering Tescos forecourt 20 yards from a pump, uphill and not a soul helped me push it.
     

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