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Old 05-18-2016, 07:40 PM
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Bosch short fuel pump leaks at electric terminals (w111)

I had the fuel pump rebuilt using new seals two years ago but found it leaking again today. I noticed this time around the leak is originating from behind the electrical terminals (brown and red plastic with screws/nuts where the wires connect) and there are not seals available for this specific portion as I can tell, but even if there were you would have to de-solder the brushes inside to get a round seal in there around the posts, or cut them which would make then useless. Has anyone experienced this issue? I am thinking I can put some sort of sealer in there from the front side and then tighten the plastic plate back down on top, but it would have to be resistant to gasoline (I don't run ethanol as a rule but may if I am on the road and can't find non-ethanol). Any suggestions?

Edit: Just after posting I checked the Pagoda site and found this relevant thread, I still welcome advice here but including this for others in the future.
http://www.sl113.org/forums/index.php?topic=24350.0

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1962 220SE W111 Coupe, 2nd owner

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Last edited by Marrs; 05-18-2016 at 07:53 PM.
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Old 05-20-2016, 07:02 AM
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Old 05-20-2016, 11:57 AM
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Hi Marrs,

I sent an email to Will Samples at S&S Imports in Dallas Texas yesterday after reading your post. Will is someone that I have found to be resourceful for fuel injection, carburetors and braking systems.

The Bosch fuel pump is very expensive to buy new. I mentioned that your pump had been rebuilt, and where your leak is coming from now. This is what Will Samples replied.

"There are 2 terminals on the side of the pump, held in place by a common
screw. Remove the screw, gently pull out the terminals (as they are hard
wired to the inside of the motor) far enough to squirt sealant Yamabond #4
between the plastic and the pump body. Gently push the terminals back in.
Screw everything back together. Let sit overnight, problem solved."
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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S

2001 S600 Daily Driver
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Old 05-20-2016, 01:50 PM
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Excellent suggestions guys, and thank you for the effort JeffreyNMemphis, much appreciated! In my case these would have probably been the better route to go since my other seals were relatively new (2-yrs) but I had already stripped my pump down in anticipation of a rebuild, lesson learned, don't get too anxious!
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1962 220SE W111 Coupe, 2nd owner

http://img.photobucket.com/albums/v3.../SideSmall.jpg

The Coupe Group (W111/112 coupes and cabs) official website
The Coupe Group on Facebook
MotoArigato: Roadworthy News & Humor
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Old 05-20-2016, 03:58 PM
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I replaced the fuel pump for my 1972 280SEL sedan with an Airtex fuel pump. It was specified for the same PSI and mounted in the rear near the fuel tank in the same place. I didn't want to pay $1,400 for the Bosch.

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S

2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com
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