The Wiert Corner – irregular stream of stuff

Some links to give us an impression how much work replacing the broken fuel pump in a R171 SLK is.

Just in case it isn’t the fuel pump but just the fuel pump fuse or fuel pump relay: there are 5 places where fuses and relais are situated in the R171:

1. Engine Pre-Fuse Box
2. Engine Compartment Fuse Box
3. Instrument Panel Fuse Box
4. Luggage Compartment Fuse Box

The last one has these fuel pump related IDs:

• №	Fused function	Amp
  4	Fuel pump assembly	20

• Relay
  A	Fuel pump relay

Articles/videos:

• Easier to read printed: [Wayback/Archive] Fuse Box Diagram Mercedes-Benz SLK-Class (R171; 2005-2011)
• Easier to read on-line: [Wayback/Archive] Mercedes-Benz SLK (R171) (2004-2010) Fuse Diagram • FuseCheck.com
• [Wayback/Archive] Mercedes-Benz SLK (R171) (2004-2010) Fuse Box Diagrams – YouTube
• [Wayback/Archive] Fuse box location and diagrams: Mercedes-Benz SLK-Class (2005-2011) – YouTube
• [Wayback/Archive] www.slkworld.com/attachments/slk-r171-fusebox-layout-pdf.598071/ [Wayback PDF view] PDF view

Via:

• [Wayback/Archive] R171 Fuse and relay locations and pics and descriptions | Mercedes SLK World
• [Wayback/Archive] Mercedes-Benz SLK-Class (R171; 2005-2011) fuses and relays | Mercedes SLK World

Fuel pump articles/pictures

Short steps:

1. Empty tank with siphon until it is below 30%
2. Empty trunk
3. Put trunk lid in the topmost position
4. Remove all lining from trunk
5. Remove plastic trunk/roof luggage divider parts
6. Unscrew electronics panel so it lowers down

Now you can check fuse and relay. If both are OK, then continue below, otherwise reverse steps 6. through 1.

7. Remove metal lid that was partially hidden behind the electronics panel (be careful with the long wires: bundle them safely)
8. Move the insulation between above lid and fuel tank up
9. Disconnect the wiring from the round plastic tank entrance cover
10. Remove round plastic fuel tank entrance that is behind the insulation so you can access the inside of the fuel tank
11. Pull the fuel pump assembly from the fuel tank
12. Disconnect the fuel pump assembly
13. Disassemble the fuel pump assembly
14. Swap the old and new pump
15. Reverse steps 13. to 1.
16. Test after reversing step 10.

Most important video is the one below about a SLK 55 AMG (it works for any R171).

Articles

• [Wayback/Archive] Fuel filter change | Mercedes SLK World with non-functioning pictures at [Wayback/Archive] images1.snapfish.com/232323232 or web.archive.org/web/*/http://images1.snapfish.com/232323232%7Ffp:95%3Enu*
• [Wayback/Archive] Fuel Filter Replacement Interval – Update | Mercedes SLK World
  

  The fuel filter replacement schedule for my 2005 SLK was 5 years, however I noticed the replacement schedule for the same part went to 15 years in 2009 so I contacted MB:

  “Thank you for taking the time to write us, we appreciate your interest in Mercedes-Benz products. Please note that we have confirmed with our technical Assistance Department that for both vehicles, the fuel filter is now replaced at 15years or 250,000km.
  Kind regards,
  Frédéric
  Customer Relations
  Mercedes-Benz Canada Inc.”

  Vehicles affected:
  SLK280 2006 – 2011
  SLK300 2006 – 2011
  SLK350 2005 – 2011
  SLK55 2005 – 2010

  …

  I own a 2006 SLK280 and the 2006 service manual states that the fuel filter is to be replaced every 65,000 miles or 5 years. However, the 2009 SLK service manual states that the fuel filter is to be replaced every 15 years or 150,000 miles.

  …

  Dear Mr. Poniatowski,

  Thank you for your email to Mercedes-Benz USA.

  The service interval for the 2009 SLK is different from the 2006 SLK, as the 2009 SLK is a new design.

  Please continue to service your 2006 SLK as instructed in the 2006 Service Manual.

  We appreciate the opportunity to respond.

  Sincerely,

  Eileen
  Mercedes-Benz USA

  So much for consistency. Maybe MB USA didn’t the get same memo that MB Canada did?

   

• [Wayback/Archive] R171 Fuel pump replacement | Mercedes SLK World with pictures in the replies:
  • [Wayback/Archive] fuelpump-jpg.375290 (352×198) fuel pressure regulator
    
  • [Wayback/Archive] fueltankexploded-view-jpg.375426 (682×377) The pump is #20 , and fits down into the hole in the un-numbered assembly right below it in the diagram. After draining your tank and removing your filter,
    1. you have to remove the sender,
    2. disconnect the pump electrical connector at the bottom,
    3. twist the two knobs out of the way
    4. lift the pump up and out.

    

  • I’m managed to release the fuel pump from the tank.
    1. This is done by moving the spring loaded catches as shown in my pictures.
    2. The pump housing then comes out by pulling up.
    3. You will need to disconnect the filter assembly and
    4. push the pipes inside the tank
    5. to allow the pump body to come through the hole.

    [Wayback/Archive] pumphousingcatchleft-jpg.377602 (352×198)

    

    [Wayback/Archive] pumphousingcatchright-jpg.377610 (352×198)

    

  • Does anybody know the way to take the plastic pump housing apart?
    I’ve got some dodgy photo’s of the screwhead but I’ve never seen anything like it, Torx, Phillips and Straight screwdrivers don’t work.[Wayback/Archive] screw-1-jpg.377770 (800×450)
    

    [Wayback/Archive] screw-2-jpg.377778 (800×450)

    

    [Wayback/Archive] housing-jpg.377786 (800×450)

    

    So the plastic housing , in the end I just had a temper tantrum with it and gave it a pull, lo and behold it came apart, no screws nothing just 4 lugs holding it together …. winner :)
    So what I had to do is take the 2 rings off the old pump and fit them gently (don’t hammer it) to the new pump, these along with the rubber type restrainers are what hold the pump loosely in the plastic housing, I did struggle attaching the main pipe to the pump and it would probably be better to get a really small jubilee clip instead of trying to force the existing clip on.
    And that was it, put her back together and she’s running like a dream :)

  • Well I am at this place too and could use some help understanding how the hose connector to the pump works. I have the ears of the connector pried outwards (pictured), but after some serious pulling in that enclosed space it hasn’t even budged! How hard to I need to pull? Am I missing how the connector locks to the flange on the pump?[Wayback/Archive] pump-connector-jpg.393777 (800×598)
    

    Never mind – better leverage was all that was needed.

  • The complete assembly (pump + housing), P/N A2114702194, was informed by master Jeff in the thread. This part is correct! The retail cost for this unit is 390 euros, tax excluded.I decided to order the pump on its own, since the housing looked perfetly fine in my case. Speaking with German autoparts seller and sending pictures of the pump, we came up with V30-09-0052, same pump used in other AMGs 55. It is manufactured by Vierol in Germany and the cost, 150 euros.Today I took the assembly apart and replaced the pump (only). They are identical and it worked as a charm. As I said, car is running great.I am sharing the pictures for others that may want to select this lower cost option as a fix for a faulty pump.[Wayback/Archive] dsc_2435-jpg.469993 (338×600)
    

    V30-09-0052
    PCS1
    X-Ref :221 470 8494
    Kraftstoffpumpe
    Fuel Pump
    Топливный насос
    Pompe à carburant
    EAC
    Charge 887066740
    742-
    4046001 562952
    VIEROL AG GERMANY http://www.vierol.de[Wayback/Archive] dsc_2433-jpg.470001 (338×600)

    

     

    [Wayback/Archive] dsc_2434-jpg.470009 (338×600)

    

  • In order to replace the pump, you will need to remove split the housing; pictures below.
    • [Wayback/Archive] dsc_2297-jpg.470089 (800×450)
    • [Wayback/Archive] dsc_2299-jpg.470097 (800×450)
    • [Wayback/Archive] dsc_2300-jpg.470105 (800×450)
    • [Wayback/Archive] dsc_2301-jpg.470113 (800×450)
    • [Wayback/Archive] dsc_2303-jpg.470121 (338×600)
    • [Wayback/Archive] dsc_2304-jpg.470129 (800×450)
    • [Wayback/Archive] dsc_2308-jpg.470137 (800×450)
    • [Wayback/Archive] dsc_2312-jpg.470145 (338×600)
  • The Vemo pump I installed is running fine in my SLK55.
    The code for the pump is V30-09-0052.

    You just need to be very careful when taking apart the plastic housing, see the pictures I previously posted in this thread. The plastic housing is hard to un-clip, it is very brittle and if mishandled it will break.

    The original mercedes Part compromises the pump + housing.
    [Wayback/Archive] www.slkworld.com/attachments/invoice-rechnung_ftm1712066920-pdf.531553/ [Wayback PDF view] PDF view

Videos (roughly in the order you need them)

1. [Wayback/Archive] mercedes slk R171 2005 feul pump replacement. – YouTube (dismounting + lowering the electronics panel; removing parts of the trunk/roof divider mechanism)
2. [Wayback/Archive] mercedes slk R171 2005 feul pump replacement part2 – YouTube (shows how to remove the metal lid and being careful with the wiring)
3. [Wayback/Archive] Mercedes R171 m272 350 slk replace fuel pump job well done – YouTube (starts after the metal lid and round plastic tank entrance have been removed)
4. [Wayback/Archive] Part 2 replace fuel pump R171 m272 350 slk 2005 model up job well done tnz sir trustedand god blees – YouTube (testing)

Separate video: [Wayback/Archive] Fuel pump mercedes slk 2005 read description!!! – YouTube (shows the location of the fuel pump)

Way better video, though much larger video with lots (~5 minutes) of prequel: [Wayback/Archive] MY 2005 SLK55 AMG GETS A NEW FUEL SYSTEM REFRESH – YouTube

The actually interesting bits:

1. 05:45 parts (way more than actually needed)
2. 07:55 full removal instructions

Parts:

• Not needed: Mercedes Fuel Tank Sending Unit – A1715420617 (EUR 50-150)
• Not needed: Electric Fuel Pump- A2114702194 (EUR 300-500)
  This is actually the full pump assembly which is costly.
  If you don’t damage the plastic, you can get away with just the pump itself which is way cheaper.
  Needed: Just Electric Fuel Pump – V30-09-0052 (EUR 100-200)
• Needed: Fuel Pump Tank Seal  – A171471027964 (EUR 10-20)
• Optionally needed: Fuel Filter – A1714701090 (EUR 200-300)
  Depending who you ask, this needs replacing every 5-15 years or every 150k km/miles.

[Wayback/Archive] Motor Mercedes SLK 200 Kompressor não funciona, Barulho compressor ar-condicionado VW FOX – YouTube is a video in Portugese (but translated subtitles work very well) with relevant details starting at  3:10

[Wayback/Archive] 2006 Mercedes SLK200 Kompressor (R171), Fuel filter change – YouTube

Related

[Wayback/Archive] Jeroen Wiert Pluimers @wiert@mastodon.social on X: “@geerlingguy Spending an hour for road assistance to arrive and diagnose (fuel pump broken) was just enough to figure out how far south and how well the Northern Light was visible. Time wel spent (:

Queries

• [Wayback/Archive] r171 350 slk fuel pump location – Google Search
• Mercedes Fuel Tank Sending Unit – [Wayback/Archive] A1715420617 – Google Search
• Full Assembly of Electric Fuel Pump – [Wayback/Archive] A2114702194 – Google Search
• Just Electric Fuel Pump – [Wayback/Archive] V30-09-0052 – Google Search
• Fuel Pump Tank Seal – [Wayback/Archive] A171471027964 – Google Search
• Fuel Filter – [Wayback/Archive] A1714701090 – Google Search

--jeroen

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