The voltage test was to be done at the trunk mounted IFS switch. At the point point you are testing is down stream of the FPDM. The output of the FPDM is such that not all test meters can accurately test a square wave. Some will. Some won't.
Unless you are looking for an EE degree, better to keep it simple.
But assuming that you have correctly measured the fuel pump wires AND you are seeing something on the VOM, the odds favor a bad fuel pump.