how much would it cost to have three hard lines (fuel) on my z71 on 2001 Chevrolet Silverado 1500

at the fuel pump, rusted bad. replaced the pump and 2 lines broke other is bad as well just lowering it

You mean the lines running down the frame? Lines at the pump module on a 2001 are plastic! Never had to replace the steel lines. Call dealer for parts price.
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On the west coast we have you pull it yards and these lines would be less than $40.00 Try this web site to check and see if a yard is close to you they keep a online inventory of what they have in the yard.