That depends on the model year, engine type, and engine displacement.
Pre 1993 carbureted models use an inline filter located in locations as follows:
Pre 1993 fuel injected models use an inline fuel filter located on the driver's side framerail, under the truck box.
1994 and later, fuel injected models, use a fuel filter that is integerated with the fuel pump module inside the fuel tank. To replace the filter, the entire fuel pump module must be replaced. This requires the removal of either the fuel tank, or the truck box. Either method is about the same amount of work.
The fuel filter on 1998 Dodge trucks, Dakota, and full size trucks and vans have the fuel filter located inside the fuel tank, It is a non replacable filter.
In the fuel tank
The fuel filter on a 1999 Dodge Dakota is part of the pump module in the fuel tank.
The fuel filter is part of the pump module in the fuel tank.
in the gas tank
In the fuel tank with fuel pump. You should not have to change the filter.
The fuel filter is located inside the fuel tank and is considered non-serviceable.
I own a 2002 Dakota and the fuel pump and fuel filter is located in the gas tank I would assume the same for a 2000 Dakota
Fuel filter\regulator is on top of the fuel pump. It does not need regular servicing.
The fuel filter is part of the pump module in the fuel tank.
On Dodge Dakota it is integral to the fuel pump module and located inside the fuel tank. The filter itself is not serviceable or replaceable. To replace the filter, you must replace the entire fuel pump.
The only fuel filter is inside the tank, part of the pump module.