I was experiencing leaking fuel from my delivery valve and this video is me repairing it. However, the parts listed below, are for my pump, and my recommendation is you go to a Bosch service center with your pump part number and get the o-ring and copper crush washer from Bosch directly unless you find an online source for your pump.

I ordered a seal kit for my pump from Europe and used the o-rings and crush washer from the kit.

I have an imported Mercedes-Benz, and therefore your pump model may be a little different; but it also might be the same. Here is my diesel injection pump part number for comparison PES5M55C320RS108-1 (Mercedes part number 6170704301).

So i got a great question today asking if the socket was a 33 point as not a 32 point and it is a 33 point. Here is a link to the exact socket I ordered and used:

https://www.ebay.com/itm/224653250658

Here is a link to the washer and o-ring (it is a kit with a bunch of parts for the pump in it) from the UK (that is where I ordered my kit).
https://injectionpumps.co.uk/product/...

Mercedes Source had this link for a pack of 10; however he has a video, and it doesn't look like the same delivery valves as my pump (but it probably is the same copper crush washer). You can check it out though here:
https://mercedessource.com/store/1977...

I also found this on EBAY which should work on this pump:
https://www.ebay.com/itm/323917702908
https://www.ebay.com/sch/i.html?_from... (This is a search term that returned two kits that would work)

And then last, but definitely not least, there is a great video by Diesel Mercedes that shows the o-ring and washer replacement on a different pump, but it is the same procedure. You should definitely watch my video and the other video before doing this job.

From Diesel Mercedes YouTube Channel: (   / @dieselmercedes7507  )
   • Mercedes Diesel Injection Pump Delive...  
Also, Diesel Mercedes' YouTube Channel is great, so please check it out. You will be glad you did.


CAUTION: Make sure everything is super clean. Any contamination that you get into the fuel delivery system can be problematic, and accidentally disassembling or unseating the delivery valve beyond the copper wash could require a very costly repair by a Bosch certified diesel injection pump shop.


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