=====Diesel Primer Pump Replacement=====
====on the 1985 300SD====
===by pwogaman===
===11/29/04===

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I've gotten loads of free advice from this and other forums. Now it is my turn to share some guidance.
This past May I replaced my original leaking fuel primer pump. It is a simple painless operation that took about 30 minutes - 15 of which was spent taking the attached pictures. 

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**The location of the existing fuel primer pump (next to the injector pump).**
http://www.peachparts.com/diy/primerpump/photo_a.jpg

http://www.peachparts.com/diy/primerpump/photo_b.jpg

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**The updated replacement part - I paid about $30.00 from a dealer simply because I was on travel and did not want to wait to find it cheaper.**
http://www.peachparts.com/diy/primerpump/photo_c.jpg

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**Use a hose clamp (I used vise grips) to close off the fuel line after the first stage filter (the clear one).**
http://www.peachparts.com/diy/primerpump/photo_d.jpg

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**Using a screwdriver, loosen and remove the fuel hose.**
http://www.peachparts.com/diy/primerpump/photo_e.jpg

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**Using either a 17mm or 19mm socket with an extension, remove the fuel line fitting.**
http://www.peachparts.com/diy/primerpump/photo_f.jpg

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**Setting the fuel line fitting aside (on top of air filter)**
http://www.peachparts.com/diy/primerpump/photo_g.jpg

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**Now you have room to access the old primer pump**
http://www.peachparts.com/diy/primerpump/photo_h.jpg

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**Remove old fuel primer pump with a 24mm open end wrench (note pinched off fuel line at bottom of photo.**
http://www.peachparts.com/diy/primerpump/photo_i.jpg

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**The new and the old parts compared. The new part came with an adapter that was not required in my application.**
http://www.peachparts.com/diy/primerpump/photo_j.jpg

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**Clean up and ensure you have removed the old copper washer.**
http://www.peachparts.com/diy/primerpump/photo_k.jpg

http://www.peachparts.com/diy/primerpump/photo_l.jpg

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**Install new fuel primer pump with a 17mm or 19mm open end wrench.**
http://www.peachparts.com/diy/primerpump/photo_m.jpg

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**Replace the fuel line fitting, tighten, and enjoy the completed project!**
http://www.peachparts.com/diy/primerpump/photo_o.jpg

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Next I'll work on posting my project of adding rear headrests. I did this in under an hour with used brackets and leather headrests I got from mercedesdismantlers.com out in L.A. for under $100 - shipped! If done properly it will be no different than if it was factory installed.

**- pwogaman**
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CategoryDiy