Automotive Help

[grover]

I have a 1991 Acura Legend LS, and today i decided to change the fuel filter. Before actually coming to the idea that it needed to be replaced, the exhaust had a heavy smell of fuel when the car is running and gets horrible mileage. When i actually got the filter off and poured out the old fuel, it looked like sewage water.
The consistency seemed normal, but the color was very dark.

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Not sure if the filter had ever been changed, but what would be causing this and how/ what do i need to do to repair it.