What would happen if the fuel pump isn't connected properly? Need help!!!

[-DSM2NR-]

Ok, well the previous owner of my car made a big mess and now I don't know which cable is positive and which one's negative on the fuel pump assembly

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Which of these cables is positive and which one's negative?

What would happen if I connect the wires incorrectly? Lets say I hook up positive to negative, instead of positive to positive...
Somebody please help me out . My fuel pump is out and I'm ready to put in a 255 but I can't do this until I figure out which wire is which

 

[-DSM2NR-]

Problem solved I know which wire's which. BUT I still had one more question. What exactly would happen if the wires are hooked up incorrectly?

 

[talon1987]

I believe the pump would spin backwards

 

[steve]

You would blow the fuse because you would be connecting the power feed to ground.

Steve