I just pulled my fuel tank on the 98 Chevy Suburban and before replacing the pump/sender, thought I would test voltage at the harness connection on top of tank. I am getting about 5.5 Volts (and pressure at Shrader had been about 20psi). At the C103 connector underhood (coming from Fuel pump relay, the gray wire), it is showing full 12+ Volts. Ground is good, as there was no difference in voltage observed between the fuel pump ground strap or running a ground all the way to battery negative. Could something have gotten weird with the gray fuel pump power wire running from C103 connector all the way back to the tank??