1991 300sl, 104.98 engine. I'm having trouble finding where this leak or leaks may be coming from. Car stumbles on acceleration. You can see in pic the fuel accumulates in mounts. Thanks

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The EHA can leak, you can buy just the 2 o-rings to reseal that.
1991 Mercedes-Benz 300SL Convertible - Fuel Injection - Page 1

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thanks Gilley,
Is it just a simple remove and reintall, or is there more to it? I purchased the o ring from pelican along with fuel distributer seal but I need guidance on install.

Sometimes.

Otherwise it's a new one and, sadly, it's quite expensive.

RayH

Right, the EHA itself can leak. It's only money, though (LOL), easy to remove and install, yes. Just the 2 screws. Try the o-rings and if it still leaks and you are pretty sure of the source, yes you can just install a new one and that's it. "The book" might tell you to check the mixture but my experience has been that replacing this won't affect mixture. Although it looks like someone may have been messing with your mixture screw already (looks like ball is gone on top of mixture adjustment tower)

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In last photo, yeah looks like someone sawed off the top of the tower, pretty "bush league" stuff, but that's the way it is in times like these.

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Thanks, What is the part missing a ball ? Any Idea where I can see a pic ? Epc is hard to tell.

You can see it in the picture you posted, the last picture, right in the middle of the screen. Is held down with 2 tamper-proof screws, those need to be removed, I usually used a small chisel to try turning them counter-clockwise. The new tower will come with a pair of new tamper-proof screws, and also a new ball you are supposed to drive in to the hole on top of the tower. If the car is running good you can skip adjusting it, or you can have the mixture checked after installing the new tower but before installing the ball. I will see if I can find the part online at this site.

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See if this makes sense when compared to the numbers that are left on the original part:

Pelican Parts - Automotive Parts and Accessories - Porsche & BMW

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Does anyone know how much to torque the two screws to on the EHA. I have '86 560SEL & did the new o-rings thing already. It worked for less than a year. So now I purchased a new EHA but I do not recall what the torque value is for the screws. I assume over-tightening will be leaky as well?
Thanks