My gas lines r leaking can I fix that myself

You can but it is not going to be easy. If the lines are leaking due to impact damages, you need not replace the complete lines. There a joint connectors available which allows you to connect the lines after snipping off the leaking area. If it is due to rust, then too bad, you would need to replace the lines.

They can be repaired but it requires having the kit to do that which costs over $200 anyway. Call around and see if anyone has the kit to repair plastic fuel lines.

http://www.dormanproducts.com/p-27520-800-300.aspx