1995 dodge 2500 van fades out when it gets to 1/4 tank of fuel

Well to start with, if you have a 1995 Dodge van and it has the original engine, you have a fuel injector for each cylinder. The last year Dodge used a carb was 1987.
So you could have injectors that are not working, or the plugs may not be firing because of the cap or rotor, or it could be a compression or vac problem.
I would want to know which cylinders and then go down the list of possible causes. You should be able to use a vac gauge or tach and pull one wire at a time to find the weak cylinders.

That is the quickest, easiest way.

could be your fuel pump, the fuel filter in out side of the tank on the line between the tank and the engine.. or the fuse relay

I don't beleive so, the 95 is OBD I and the 96 is OBD II. Plus you'll need to verify the exact transmission according to engine and 4X4 or 4X2.

i would say they sold you the wrong fuel pump

sounds like a possible pluged fuel filter or a tired fuel pump. the pump is cooled by the gas. so if you work it at 1/4 tank or below it tends to get hot. but towing may make it hot anyway. check fuel pressure and the replace the fuel filter

yes as long as the engines are the same mobel

sounds to me like the fuel pump is bad, when it warms up it dies, try to check this by filling the tank and running a while, then run the van with a near empty tank and see how it does. A full tank of gas should keep the fuel pump cool as it is surrounded by the liquid. I had a similar problem. when my tank got to about a quarter full (3/4 empty) the van would shut off after a short distance, then after sitting for a while would start up again get me a little farther then shut off again. i ended up changiung the fuel pump cost me almost $300. if this simple test shows no results the you got electrical problems, check distributor, and surrounding cables. good luck. also check your fuses could be dirty!

Maybe in front of passenger rear wheel area, up underneath attached to frame?

Yes, please read the article at this link.