am guessing the black is ground. If you turn key on and touch it to the terminal on the pump marked - and nothing happens its the ground. To check look at the fuse to see if its blown. Fuse is good then its ground.
Make sure you have a gallon of gas in the tank when you try it. Turn key on push red kill switch to off then to run. Do this two or three time to fill the pump with gas.
Not trying to be mean but you should never do any electrical with out a meter there cheap and you can get them every wear
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