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Old 02-12-2006, 07:50 PM
douging's Avatar
1972 280SE 4.5
Join Date: Jan 2006
Location: Massachusetts
Posts: 73
22mm Fuel Tank Drain socket


If anyone wants to borrow a 'socket' to un-screw the drain plug on their gas tank, contact me via PM and we can set up a borrow. I used it on a W108 (280SE 4.5) but I'm sure other cars use a 22mm Allen.

You can easily make one yourself with a 22mm bolt (7/8" works as well) and a corresponding nut. Any local garage will be able to weld the two together for you. Or use two nuts to jam them together. I lucked out and found this nut in my house and a friend had the bolt. Lowes, Home Depot, and a local hardware store didn't have anything bigger than 3/4" (forget about metric) and my local Sears didn't have any Allen wrenches bigger than 17mm.

Picture of what I made:



Last edited by douging; 02-12-2006 at 07:56 PM. Reason: more info
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Old 02-12-2006, 07:57 PM
Registered User
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
There is an easy trick to getting the 22mm plug out.
Take a 1/2 drive spark plug socket and insert an extension bar into the plug socket from the plug opening end . The hex top of the socket will fit the 22mm allen head on the tank drain plug....use a 1/2 drive ratchet on the !!!

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