How can you tell if you have a bad filter or a bad fuel pump on a mpv?

The best thing to do is replace the fuel filter anyway. You will need to do it even if the fuel pump is bad, so you have nothing to lose. You can listen to hear iif the fuel pump is kicking on at all. If it is, just do the fuel filter. Its much cheaper and easier than the fuel pump. Then you can test the fuel pressure to see if the pump is bad after you replace the filter.