Hi There, please someone help me LOOL

i have a Seadoo GTX DI I have had for a few years and itís been great, I started to experience starting issues and found that my fuel pump had gone faulty, I stupidly replaced it with a cheap Chinese one that failed straight away, I then bought another better one and it worked perfect for 3 hours then it failed I canít hear the pump prime when I put the key one so I checked the voltage going to by the pump one a meter and that was 4.8 - 5 volts? Does anybody know if that is the correct priming voltage for the pump and I just have a faulty pump or should the priming voltage be something else and there a different problem with the ski, thank you please help.