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* Gas Filler-Neck Area - Drain Hole? *

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mgburg's picture
Onalaska, WI
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Joined: December 27th, 2005

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1977 280E
1976 450SLC

I went to fill my 450SLC last night and I noticed that the area where the hinge for the cover sits was full of standing water (Rained like HADES for the past 2 days up here!). None of it up or near the filler-neck, but still in the area nonetheless.

Where, exactly, would the drainage spot be? Fore or Aft of the filler neck and how large? If I took a coat-hanger and poked around, would that free up the blockage?

I've tried to look down into the abyss, but neither light nor torch does the trick (I'm kidding on the torch part!!! :eek: ).

BTW, my trunk and other assorted nooks and crannys are still dry...so that's a good thing! :Thumbs up:

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H-townbenzoboy's picture
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1981 300SD
Re: * Gas Filler-Neck Area - Drain Hole? *

mgburg;199971 wrote:
I went to fill my 450SLC last night and I noticed that the area where the hinge for the cover sits was full of standing water (Rained like HADES for the past 2 days up here!). None of it up or near the filler-neck, but still in the area nonetheless.

Where, exactly, would the drainage spot be? Fore or Aft of the filler neck and how large? If I took a coat-hanger and poked around, would that free up the blockage?

I've tried to look down into the abyss, but neither light nor torch does the trick (I'm kidding on the torch part!!! :eek: ).

BTW, my trunk and other assorted nooks and crannys are still dry...so that's a good thing! :Thumbs up:

On the W123, there is a drain in the lower left hand corner of the filler area. If it's not obvious in location as it is with the W123, I'd bet its located somewhere around the hinge and hidden.

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Re: * Gas Filler-Neck Area - Drain Hole? *

Slip on waterproof gloves and poke around with your finger, it'll be 3/8" and easy to find. And won't scratch paint like a coat hanger.

Clean it with compressed air.

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mgburg's picture
Onalaska, WI
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1977 280E
1976 450SLC
* Gas Filler-Neck Area - Drain Hole? *

Gentlemen:

I found the hole...I "scooped out" a bit of gunk (I'm ashamed to say) and I used a very thin piece of wicker (sp?), from an old chair that was in my basement, to "probe" the tube leading from the area...there was a impediment in the tube, about 3"-4" down. Once that was cleared and bigger chunks of schmutz was removed, I rinsed the area clean. It's clear and flowing nicely...not that I want to be using it on a regular basis (with gasoline!)...

Another item, to do a "PM" on, to add to the list. :rolleyes:

I figured if water is getting trapped when it wasn't getting trapped before, there HAD to have been an exit...

Again, thank you two for the quick response. :Thumbs up:

BTW, the "hole" is located to the left and as far back as possible at the lowest point in the "filler pocket" - once the gunk was removed and the area rinsed clean, it was quite obvious. It appears (to this untrained eye) that the "hole" has either a grommette with a hose attached or the tube/hose is a one-piece item that "plugs/snaps" into the hole after being fed into the hole from above.

Since it was drizzling when I "fixed it" - I didn't feel the need to investigate the routing of the hosing 'til the weather gets a bit better...like maybe this weekend.

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Marshall Welch's picture
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Drains into wheel well

It drains into the wheel well, on my W123, at least. I had the same problem you're describing. I used a long, large zip tie to poke the debris out and open up the drain tube. Once you know about it, it's fairly easy to keep it functioning.

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