Fuel pump

Well, you have your in and out line and the other is most likely for sending unit

What should I buy to fix the problem?

Your fuel lines are already there along with sending unit, are they not?

Yes but the hole I don't have anything to go in it won't gas come out the hole

Doesn't the hole have to be covered

??

Well yes, that is for the sending unit. Get a mechanic on it at a local shop

I have now cord to plug up a sending unit could you send me a picture of what I need to get for the hole I don't have any shop around where I live

If you could send picture what I need to get that would be awesome

Walt, I think I can help. Is this for your 2003 Windstar? If you look at the picture you posted, it says 99 to 00 Windstar. Those year Windstar's had a special electrical plug on the top, and that is what the hole is for. You need to return that Fuel Pump Assembly and purchase one for your 2003. Motorcraft PFS10 or equivalent.