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I suppose back side and front side are open to interpretation. I think of the back as being where the discharge port is and the front as being where the suction port and pump rotor is located. I assume that the leak is coming from the 'front side' (my interpretation) of the pump. My old Bosch pump (almost 40 years old) was pumping just fine; but, developed a leak around the terminal plug (front side). I have heard about the epoxy repair; but, I passed on that solution since it is a bit of a bodge job involving plastering epoxy around the base of the connector and crossing your fingers. Maybe; but, not for me. As noted, the pump rotor is sealed with a circumferential O ring trapped in a groove. I would be surprised if this is leaking; but, I guess it could have dried up and shrunk or cracked. If you can find a new larger diameter O ring of the same thickness (or slightly thicker), cut it to length to fit in the groove. There is a Loctite adhesive that is excellent on rubber and can be used to glue the cut ends of the new O ring together. The number of the adhesive escapes me at present; but, I am sure I will wake up in the middle of the night with the number in my head. If you search for 'most expensive Loctite adhesive in the world' you will probably find it. It is something like $25 for a 10 or 15 ml bottle.
If you can't find a suitable candidate for the O ring transplant, you could try sealing the pump head with the old O ring and Hylomar blue sealant. Excellent stuff. Genuine Hylomar is pricey; but, no where near as pricey as the special Loctite stuff. Permatex makes their own version of Hylomar. I think that they used to be licensed to call it Hylomar; but, no longer. They refer to it as being Hylomar similar, or Hylomar like, or .... It is also blue and pricey; but, not as pricey as the genuine Hylomar. Hylomar and the Permatex copy are not super common so you may have to search a bit to find them. Aircraft mechanics seem to have a particular love for the stuff.
|In case you get frustrated trying to do a repair on the Bosch pump, my Nissan replacement pump has being going along just fine for nearly a year now with no drama. The Airtex pump that I initially got to replace the Bosch probably had less than 60 days of actual operation before it started making bad noises.
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