Fuel line conectors fuel tank to filter blue conectors and black conectors.Why

This is Kevin with NWA Auto Shop. Without seeing the vehicle, I can only theorize. Based on the limited information given, these are my thoughts. A) I would look for a picture or diagram online usually your new pump has the diagram on it also. Most fuel pumps have a supply, return and vapor line. They tend to line up with where they should be on their own or only connect one way. The manufacter usually has a tech line that can help also for after market items. Kevin