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Ran boat yesterday before purchase no issues did comp check spark and lower unit no problem drive home 3 hrs now it wont start. It cranks it has spark fuel pump comes on has fuel psi. Tracked it to the 20 amp fuse 02 Sensor/fuel injector it blows fuse as soon as u turn key to on position so I would say something has a dead short. I tried it with 02 sensor un plugged same thing. Thoughts?