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There are several possibilities. Mine was leaking from the large rubber tube going from the filler neck pipe into the back of the tank; it had an age slit in the side. On the top surface of the tank is the fuel pump sender 'plate'. it has a rubber gasket that can go bad, or get out of position. You can see this if you lift the back seat cushion and unscrew the access plate. There are also a couple of vapor hoses - one that runs up to the charcoal canister, one that runs to a small tube on the filler neck. This one allows the air bubble on the upper side of the tank to escape when you fill it with gas. These tubes you wont be able to see the 'tank' end of until you drop the tank down; which is a time consuming chore.
If the leak is from the large rubber tube going into the back side, or the medium sized rubber tube that is next to it - you can usually replace those just by unbolting the fuel filler neck to give yourself some working room.
It has also happened that the fuel filler neck assembly itself has rusted through and leaks. Its made of steel. Mine was rusty, tho not rusted through. I cleaned it well and painted it with rustoleum.
 

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... On the top surface of the tank is the fuel pump sender 'plate'. it has a rubber gasket that can go bad, or get out of position. You can see this if you lift the back seat cushion and unscrew the access plate. ...
Though unlikely compared to all else mentioned, fuel line can leak from that same location as well.

If it doesn't leak when the tank is below 3/4 full, then it's less likely to be that gasket.

From personal experience, any replacement gasket has to be a *perfect* fit like the original. I know there are some new replacements being sold through parts stores that aren't a perfect fit, and will leak when you fill it up at the station.

If you replace this gasket, take a plastic handpump that's approved for gasoline with you on your first fill-up at the fuel station. That way you can suck fuel back out of the tank incase that seal leaks. You can leave more than enough in there to get back home.
 

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94-95 escorts had a recall for the gas tanks cracking around the top near the fuel pump, it could just be the o-ring bad or out of place. pull the backseat up, take 4 phillips screws out and inspect around the pump.
 

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Hey pal...you live in Cleveland! RUST BELT! No better here, mind you.

When I replaced my pump last fall, the steel fuel lines from the pump hanger assembly, had rusted and pitted to a point where the high side line fell apart in my hands, while removing the old pump.

Mine was leaking there and was hard to detect until I pulled (or tried to pull) the pump assembly in one piece.
 

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bottom back seat comes out that the wiring to the fuel pump is right there
 
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