I am planning on replacing all the fuel lines and the strainer located above the main fuel line going into the bottom of the tank soon. I saw this rubber piece in the bottom of the fuel tank and kinda looks wet around it. I am thinking it might be a cover for a drain plug but wanted to ask on here before I try pulling it out and have my tank dump. Maybe I need to replace the gasket around the drain plug? If there is one underneath it.

Thanks

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85 300D Turbo

That thing on the bottom is the metal wheel well for the spare (under the floor of the trunk) The fuel tank is inbetween the rear firewalls and the rear seat, right above the rear axle. Does it have a smell, it looks like the rubber lines inbetween the tank and metal lines are leaking and its drooling along there, I'll bet thats the problem.

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

That looks like a trunk water drain to me. Like the ones behind the rear wheel wells. The fuel tank in the sedans isn't underneath the car, it's in the front most part of the trunk, I believe.

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Thanks.

That makes sense now. I will be replacing the line soon.

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85 300D Turbo

There's one of those little rubber thingies in each trunkwell as well. It's a good idea to make sure they are not filled with crud from either side (just in case something spills, or your window gasket is getting old).

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

You don't need to replace that rubber boot unless it is failing.

That has nothing to do with the fuel system (as others have said). So clean it out and finish replacing your fuel lines.