LenLich Posted February 17, 2021 Report Share Posted February 17, 2021 How to tell if fuel pump is bad on 2004 mb 5.7 350 engine? Quote Link to comment Share on other sites More sharing options...
bloodiestcadaver Posted February 17, 2021 Report Share Posted February 17, 2021 fuel guage reading would be best, but IF you don't have one. try and see if you can hear it running. It should be a two wire pump. power and ground. test light or power probe will work. It should have very close to battery voltage and a solid ground. Quote Link to comment Share on other sites More sharing options...
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