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220SE W128 Fuel tank?
Topic Started: Tue Nov 14, 2017 2:41 pm (119 Views)
I am working on a 1959 W128 220SE sedan, which is the fuel injected model. It does not have the original fuel tank and the tank it has had tubes soldered into it. The original tank had what was known as a "flower Pot", about 5 inches diameter, inside the tank located over the the drain plug in the center of the tank. The fuel pickup is supposed to feed out from this "flower pot" and the idea is that this container reduces sloshing at the fuel pickup location and the electric pump will not suck air as the fuel sloshes about, which will cause stalling especially as the fuel level drops. (I attached a picture of the insides of a W113 fuel tank with a flower pot, which is similar)

Also, the 220SE tank has both a fuel pickup line as well as fuel return line at the tank. I dont know where to find a 220SE fuel tank (unless someone has one, let me know)

The standard gasoline model tanks (180, 190, 220S, etc) do not have a "flowerpot" inside the tank and also do not have a return line. The diesel models do have both a pickup and return line. I don't have a diesel to look at the insides of how that tank is designed. Are the diesel style tanks set up with a "flower pot design" or how is the insides arranged on these? I'm wondering if a tank from one of the diesel models might work on the SE?
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Edited by Rick, Wed Nov 15, 2017 10:06 am.
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Hi Rick. Thanks for the photo. I'd never even heard of a "flower pot" in the tank.

Regarding a fuel tank, you might want to email Tom Hanson at the Classic Center, or Henry Magno:

thomas dot hanson at mbusa dot com

henry at magnorestorations dot com

Tom M.
Edited by FreemanGarden, Tue Nov 14, 2017 7:05 pm.
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I have both a '60 220SE and a '68 280SE and am very familiar with the flower pot. An ingenious design. In addition to minimizing sloshing, It also generates a low pressure area in the pot because the return fuel coming in does so at an angle and swirls the fuel. Similar to a tornado. The lower pressure area in the pot forces the fuel in the pot to rise slightly higher than in the surrounding tank. If you want much more info, go to SL113.com. Injection systems such as this were new on the Pontons, but common on the post-Ponton cars.

Bad news on the tank. It is different and I have never found a replacement. They are rare as hens teeth. I refurbished mine which had some dents. I have also never seen one for sale. You could ask Tom Hanson if a diesel on might work. Not sure if the fuel output tube is in the same on this tank as others. The position of the output tube is critical. While the electric pump has some suction, it is mostly gravity fed and relies on the tube being higher than the pump's inlet. See attached pics. I wish I took more, but that is all I have. I also retrofitted a new short type pump on this car. That was a challenge!
Good luck on the tank.
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Edited by wwheeler, Tue Nov 14, 2017 10:43 pm.
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