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  #1  
Old 12-11-2004, 05:09 PM
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Gas tank plug tool size?

I am in the process of removing my gas tank to have it boiled out after 41 years. I found some rust particles in the fuel filter and suspect they might be the culprit in the reason my engine misses on start up. Does anyone know the size of the male tool that will fit in the gas tank female plug at the base of the gas tank of a 1963 220 SEb 111 chassis? I tried to take a measurement and my closest estimate is 29/32 of an inch. I suspect all sizing on a MBZ is in mm.

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  #2  
Old 12-12-2004, 12:30 AM
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29/32 is 23 mm, but the plug is 22mm....7/8" will work.
Many guys just weld a 22mm or 7/8" hex head/bolt at a right angle to a small length of 1/2 steel pipe for a homemade wrench..
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  #3  
Old 12-12-2004, 12:55 AM
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Art,
I was running around all day trying to find a tool that would fit without luck. Your solution is so simple. Thanks.
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  #4  
Old 12-12-2004, 01:15 AM
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According to my shop manual, that drain plug also contains a fine-mesh screen that you may need to clean or replace.

Happy Motoring, Mark
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  #5  
Old 12-12-2004, 07:40 AM
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Better for your tool to fit snug than a little loose, the plug is brass and will round out easily.
Try to loosen the plug BEFORE you drop the tank, you will need the extra leverage, that bugger will be in there tight....
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  #6  
Old 12-12-2004, 11:39 AM
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Quote:
Originally Posted by Mark DiSilvestro
According to my shop manual, that drain plug also contains a fine-mesh screen that you may need to clean or replace.

Happy Motoring, Mark
There was a change on the Early First Version screens.. the early were prone to clogging cuz they were too fine . If you have that version , replace w/second version.
You can tell the difference as the first version is hard to see through when held to light , with the second very translucent.
The first was more of a gauze screen, the second was a definite square screen pattern......
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  #7  
Old 12-13-2004, 12:52 AM
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the size is 22mm. Old Craftsman plug socket (the larger one) is that size on the butt (or where you engage the driver) very easy... yes, the mesh screen should also be there. mine was the guaze kind. easy to inspect and clean...
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  #8  
Old 12-13-2004, 03:28 PM
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interior fuel tank coating

Word of caution:

I had my tank redone with Renu just recently. The tank looked great when it was done but found out later when we re-installed it that they plugged up the internal fuel lines. These lines run from the the filter (on the back side of the mentioned brass plug) to the outlet and from the return line to the filter.

Altough I can't be certain, I believe we burned out the fuel pump trying to start it without fuel running through it. I found the impeller of the pump welded in place upon inspection.
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  #9  
Old 12-13-2004, 10:29 PM
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Brass gas tank plug removal option

67 Coupe,
Thanks for the heads up on possible plugging. I finally removed my gas tank. Once the fuel was removed, it was pretty simple, having been held in place by only 3 bolts ( It was pretty gunky inside). I was finally able to remove the brass plug on the bottom of the tank by inserting a thick 7/8 nut half way in the female slot (it fit snuggly) and then taking a 7/8 socket and torgue wrench to unscrew it. I have a question for those previously recommending replacement of the screen attached to the plug, if needed. I can't see where the screen is removable. If I want to replace the screen, do I have to purchase the screen and plug as a unit? The other question is the gasket between the fuel sensor and the top of the tank was in bad shape. Is this a standard parts store item or do I have to visit the MBZ dealer for a replacement?
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Gas tank plug tool size?-fuel-level-sensor.jpg  
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  #10  
Old 12-13-2004, 10:43 PM
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Screen comes with plug..

These are 113 chassis, but should fit yours..

http://www.kkmfg.com/catalog_fs.php?Page=/images/113/113fuelexhaust.swf
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  #11  
Old 12-13-2004, 11:22 PM
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I presume your sender gasket is/was a thick flat cork or rubber ring with 5 or 6 holes for the bolts that hold the whole thing together. If you want a ready-made replacement, it's possible a parts store has something listed for a later Swedish or German import with the same size VDO sending unit (perhaps a mid-80s BMW 5 series or Volvo 240) or you can try the MBZ dealer or Phil here at PartsShop/Fastlane. If you're willing to make your own, most better autoparts stores stock sheets of gasket in various thicknesses and materials.
I've seen a thick, rubberized cork suitable for a tank sender gasket.

Happy Motoring, Mark
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  #12  
Old 12-15-2004, 04:27 PM
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Gas tank boiled out

Got my gas tank back from being boiled out. After pricing out a new bottom plug screen, I decided to reuse the old since it looked like the newer type recommended in previous threads. Painted the tank red just for the fun of it sense I am not a purist and having made other non standard modifications to the old 111.
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Gas tank plug tool size?-mbz-gas-tank-boiled-painted.jpg   Gas tank plug tool size?-bz-gas-tank-top.jpg   Gas tank plug tool size?-bz-gas-tank-drain-filter-bung.jpg  
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Last edited by Gregg Bambo Jr.; 12-15-2004 at 04:36 PM.
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  #13  
Old 12-15-2004, 05:04 PM
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Could someone explain the purpose behind this plug screen? Is fuel supposed to flow through it on it's way to the pump with crud being depositied on the screen? Wouldn't a dirty screen just cause the fuel to travel around it?

What I do understand is a red fuel tank adds between 15-20hp to your vehicle. EVERYBODY knows that!
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  #14  
Old 12-15-2004, 05:38 PM
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<>

That is your best bet cuz the replacement plug/screen assembly is now Plastic...
They strip and they crack...
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  #15  
Old 12-15-2004, 05:51 PM
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[QUOTE= Wouldn't a dirty screen just cause the fuel to travel around it?


The fuel gets filtered through the screen to reach the pump. How could it go around it ???
If the screen is plugged , you get no fuel..

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