OM606 EPC light on after shut off valve O ring replacement.

Discussion in 'Engine' started by neilrr, Jun 10, 2017.

  1. neilrr

    neilrr MB Club Veteran

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    A friend has a '98 W210 E300 TD saloon that had a pretty bad leak from the O ring on the fuel shut off valve.

    He replaced the O ring, put everything back together & after a lot of cranking the car fired up. He nearly flattened the 210's battery, then hooked a running car up to the 210's battery to get the thing started. He has since recharged his 210 battery & is confident it is OK.

    Problem is, the EPC light has come on. The car seems to run fine, at least on the driveway.

    Any idea why the EPC light is on & how to get rid of it?

    TIA.
     
  2. bob6600

    bob6600 Hardcore MB Enthusiast

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    If the leak is cured he has or is still getting air in. Is he confident everything is put back correctly and air tight? Does it repeatedly start ok now? Try giving it some throttle and see if there are bubbles in the clear pipes (I'm assuming the PF has them too)
     
  3. OP
    OP
    neilrr

    neilrr MB Club Veteran

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    The leak is cured.

    He is an experienced mechanic & is confident it's all back together as it should be.

    Starts fine again & again.

    What's a PF?
     
  4. bob6600

    bob6600 Hardcore MB Enthusiast

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    Sorry - Pre-facelift
     
  5. toolman1954

    toolman1954 Hardcore MB Enthusiast

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    Hi,
    Now your leak is fixed has the EPC (electronic power control) light now gone off ? If not, when was the fuel filter last changed. There is also a small filter just after the pump. There are pictures on other threads of the pipes and filters, just search for 300td leaking fuel pipes . At the age of your friends car ( 1998 ) 19 years old, if they have not been replaced recently, then all the clear fuel pipes will be getting old and brittle and start leaking. Easy and cheap to get new seals, but in my opinion you are better off putting on nice new pipes which you can get from Mercedes, and then that solves any worries over the pipes.
    Also get him to cast his eyes onto the top of the pump and check there is no weeping from the delivery valves, another source of leaks at this age of the vehicle.
    There are several threads on here about curing leaks to get rid of the EPC light being on and also there is a "delivery valve seals replacement" "sticky", which is useful for reference purposes. Also if the battery is getting weak it will not be helping churning it over to bleed out the air, nor for that will a matter will a weak starter motor, which may be the original. I hope he gets it sorted. ( Been there, done it all, got the T shirt !)

    Steve
     
  6. OP
    OP
    neilrr

    neilrr MB Club Veteran

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    toolman,

    The EPC light only came on only after the shut off valve leak was fixed. No light before leak, or while leak was leaking.

    Fuel filter changed about a year /4,000 miles ago. He's changing it again as it's the cheapest potential remedy. Pre-filter will be checked & cleaned at the same time.

    No evidence of air or fuel leaks in or from the clear plastic fuel lines.

    The fuel pump is clean & dry - no leaks from the delivery valves.

    Battery is recent & been recharged after nearly going flat starting the car following the SO valve replacement. It's fully charged now.

    If the fuel filter change doesn't work he'll get it plugged into a Star machine rather than throw parts at it.
     
  7. OP
    OP
    neilrr

    neilrr MB Club Veteran

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    This seems to have cured itself on its own.


    The light didn't come on again, been driven 3 separate journeys for a total of about 100 miles & everything is OK. :dk:
     
  8. a111r

    a111r Hardcore MB Enthusiast

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    I thought it would, after a drive.
    EPC error is the preserve of CDIs.
    Not much EP control over anything relevant, on 606s?
     

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