Recheck that you have correctly attached all of the fuel lines to the fuel distributor properly. I doubt the problem is with the F/D. When they are rebuilt they are tested. You say you had an "overfueling" problem originally. One possible cause is a blocked return line to the tank. Do not go by how the lines were, get a diagram and make sure each line goes where it is supposed to. A PO could have incorrectly installed the fuel lines. Next, get a fuel pressure gauge on the fuel system so you can see what is happening. This should be done before you put another F/D in and possibly damage that one too or another accumulator or hoses.