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W211 low fuel pressure under hard acceleration star code 22e7

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by mshah70, Jun 8, 2018.

  1. mshah70

    mshah70 Senior Member

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    Your Mercedes:
    Mercedes w211 2007 E220 Cdi
    Hello
    Owner of merc w211 e220 Cdi 2007
    226k

    I am having low fuel pressure issues.
    Star diagnostic code 22e7
    Check high pressure control ‘rail pressure too low’

    When i open up the throttle (hard acceleration) going up a hill or on motorway, the engine light comes on and car goes into limp mode.

    I used Star to check high pressure control, Quantity control valve, pressure regulator all sensors seem To be in working order.

    I tested the low pressure circuit, fuel pump seems to be in working order.

    Please i need some help.
     
  2. LostKiwi

    LostKiwi Senior Member

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    Location:
    Midlands / Charente-Maritime
    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    When was the fuel filter last changed?
     
  3. mattkh

    mattkh Senior Member

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    Your Mercedes:
    W168 1999 1.6
    What was the fuel pressure reading on your test while going uphill ?
     
  4. OP
    mshah70

    mshah70 Senior Member

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    Your Mercedes:
    Mercedes w211 2007 E220 Cdi
    I last changed the fuel filter in the engine bay about 3000 miles ago.
     
  5. star

    star Forum Supporter Authorised Forum Supporter

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    Reading
    Your Mercedes:
    Smart + others :)
    Check injector leak off.
     
    mshah70 likes this.
  6. OP
    mshah70

    mshah70 Senior Member

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    Your Mercedes:
    Mercedes w211 2007 E220 Cdi
    I only checked the fuel pressure at idle
    By connecting to fuel filter inlet
    Pressure was just under 4bar

    Also after a single initiation of the fuel pump, the fuel output was 700ml, which star said was ok
     
    Last edited: Jun 8, 2018
  7. OP
    mshah70

    mshah70 Senior Member

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    Your Mercedes:
    Mercedes w211 2007 E220 Cdi
    Can u guide me on how to do leak off myself, and where can i get the proper test kit
    Thanks
     
  8. Westheath

    Westheath Senior Member

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    Your Mercedes:
    Empty garage, awaiting new toy :)

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