1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Fuel gauge

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Big Cheese, Mar 7, 2019.

  1. Big Cheese

    Big Cheese Senior Member

    Messages:
    68
    Likes Received:
    12
    Joined:
    Feb 22, 2017
    Location:
    WEST MIDLANDS
    Your Mercedes:
    ML63 2007
    After changing my dead battery, I've been left with the fuel gauge showing full all the time the car is on.
    Anybody else encountered this and have the fix?
    Or is there a reset procedure that needs to be followed?
    Any insight greatly appreciated.

    Sent from my VKY-L09 using Tapatalk
     
    mercmancdi likes this.
  2. sonic

    sonic Senior Member

    Messages:
    917
    Likes Received:
    291
    Joined:
    Nov 21, 2009
    Location:
    Staffordshire
    Your Mercedes:
    E350CDI, SLK200K, FJR 1300
    Not sure about MB's. But on Land Rovers if the live is not connected to the sender it always reads full.
     
  3. mercmancdi

    mercmancdi Senior Member

    Messages:
    2,462
    Likes Received:
    340
    Joined:
    Dec 6, 2011
    Location:
    templepatrick - co antrim
    Your Mercedes:
    2009 E250 cdi 08 cls320 cdi ,2007 e280 cdi '2005 E 280 CDI ,VW TOUAREG ,JAGUAR S AND xTO NAME A FEW
    Mine reads empty then I jump started it from engine bay jump points and it started to work again but then stopped again.
     
  4. colin ling

    colin ling Senior Member

    Messages:
    57
    Likes Received:
    5
    Joined:
    Feb 9, 2004
    Location:
    colchester
    Your Mercedes:
    ML 280 CDI 2008
    Good morning
    On my 2008 ML the rear Sam got damp and the fuel guage read higher than it should
    The same Sam fault also caused the nearside rear door lock to play up and set off the alarm
    The ML was in a garage where I could not hear the alarm and it flattened the battery
    A new Sam cured the fault
    Good luck
     
    mercmancdi likes this.
  5. mercmancdi

    mercmancdi Senior Member

    Messages:
    2,462
    Likes Received:
    340
    Joined:
    Dec 6, 2011
    Location:
    templepatrick - co antrim
    Your Mercedes:
    2009 E250 cdi 08 cls320 cdi ,2007 e280 cdi '2005 E 280 CDI ,VW TOUAREG ,JAGUAR S AND xTO NAME A FEW
    Did you go for a used Sam or new one if used would you share what it cost to buy and code in.
     
  6. Mark A

    Mark A Senior Member

    Messages:
    823
    Likes Received:
    39
    Joined:
    Aug 13, 2006
    Location:
    Aberdeen
    Your Mercedes:
    08 ML-420CDI, 58 ML-320CDI, 55 SLK-350
    Before you even think of fitting a new SAM I would find out and rectify where the water is getting in. Common sources are rear light cluster and 3rd (high level) brake light.

    Cost of a new SAM from MB is +/-£490 + coding (still haven’t had mine coded yet as most things still seem to work straight out of the box.

    Mark
     
  7. colin ling

    colin ling Senior Member

    Messages:
    57
    Likes Received:
    5
    Joined:
    Feb 9, 2004
    Location:
    colchester
    Your Mercedes:
    ML 280 CDI 2008
    I went for a Mercedes refurbished from a main dealer. It seems MB sell some parts refurbished / repaired mine cost £283 from MB Oxford. Coding was at an Indi and was not simple, some things did not work 1st time, but were sorted 2nd time, I cannot remember cost but it only takes half an hour. Its surprising how many things the rear Sam works, ie the front seats, you would assume there is a list somewhere but I assume it depends on the spec of the vehicle
    With regards to water leak I think it was rear lamp cluster, Mercedes now have an extra thick rubber gasket for the problem, they know all about the problem and my local MB main dealer keeps the Sam in stock and told me they sell a lot of them.
    I moved the Sam to an upright position near the rear fuse panel and it has a piece of modern breathable roofing membrane over it. The wires are long enough to move it, just do it gently when repositioning the cables
     
    mercmancdi likes this.
  8. DREAMER NO2

    DREAMER NO2 Senior Member

    Messages:
    2,607
    Likes Received:
    309
    Joined:
    Dec 29, 2013
    Location:
    Kidderminster in Worcestershire
    Your Mercedes:
    W124 2.6E M103 1989
    Try one thing first .If its petrol engine that is , tip in 1/2 a bottle of RED-X in the tank fill up and see how it goes. The gum up inside and it stops the float from going down when fuel gets less
     
  9. mercmancdi

    mercmancdi Senior Member

    Messages:
    2,462
    Likes Received:
    340
    Joined:
    Dec 6, 2011
    Location:
    templepatrick - co antrim
    Your Mercedes:
    2009 E250 cdi 08 cls320 cdi ,2007 e280 cdi '2005 E 280 CDI ,VW TOUAREG ,JAGUAR S AND xTO NAME A FEW
    Mine has electronic fault , waiting to see if Nitec can repair it without spending a fortune on new part.
     
  10. DREAMER NO2

    DREAMER NO2 Senior Member

    Messages:
    2,607
    Likes Received:
    309
    Joined:
    Dec 29, 2013
    Location:
    Kidderminster in Worcestershire
    Your Mercedes:
    W124 2.6E M103 1989
    This post was for poster no1 .
     
  11. mercmancdi

    mercmancdi Senior Member

    Messages:
    2,462
    Likes Received:
    340
    Joined:
    Dec 6, 2011
    Location:
    templepatrick - co antrim
    Your Mercedes:
    2009 E250 cdi 08 cls320 cdi ,2007 e280 cdi '2005 E 280 CDI ,VW TOUAREG ,JAGUAR S AND xTO NAME A FEW
    So was mine , thinking the more information the better.
     
  12. OP
    Big Cheese

    Big Cheese Senior Member

    Messages:
    68
    Likes Received:
    12
    Joined:
    Feb 22, 2017
    Location:
    WEST MIDLANDS
    Your Mercedes:
    ML63 2007
    I've had the rear sam unit checked & comes back with a clean bill of health,sender unit checked & that also showing ok,star diagnosis done & still no fault but fuel gauge still shows full all the time.
    Anyone have any idea's?
     
  13. umblecumbuz

    umblecumbuz Senior Member

    Messages:
    3,577
    Likes Received:
    926
    Joined:
    Sep 20, 2010
    Location:
    Wales and Gozo
    Your Mercedes:
    S204 and CLC 204 cdi, other non-Merc machines
    Give the guage a sharp tap!
     
  14. DREAMER NO2

    DREAMER NO2 Senior Member

    Messages:
    2,607
    Likes Received:
    309
    Joined:
    Dec 29, 2013
    Location:
    Kidderminster in Worcestershire
    Your Mercedes:
    W124 2.6E M103 1989
    Reset as if battery as been removed ..
     
  15. OP
    Big Cheese

    Big Cheese Senior Member

    Messages:
    68
    Likes Received:
    12
    Joined:
    Feb 22, 2017
    Location:
    WEST MIDLANDS
    Your Mercedes:
    ML63 2007
    I've tried the battery reset,still no good.
    I will have to give the gauge a sharp tap,hopefully not to sharp though.;)
     

Share This Page