My 2004 nissan sentra will not start, just turns over.obd code po455,po183 and po463 not sure what to check. I tried gas cap, took gas line off and turned car over but no fuel, it my be my fuel pump but the cost of $790.33 I am hoping it is something simple. If you could help it would be great. Thanks

You need to connect a obd code reader to clear the code.

https://www.infinitiusa.com/recalls-vin/#/

Anytime you have someone get OBD Vehicle codes for you,
put them into Google
OBD PO455 & read up

Don't worry I'm sure you will get the solution of your problem, just check the link I attached 1997 Nissan sentra

If those are fuel lines then fuel would be coming out. There are lines that carry fuel vapor for the EVAP system. If these lines you are looking at are the EVAP lines (sounds like they are) then this would be the cause of the large EVAP leak.

This error means that there is a leak in the evaporator system. Check first the gas cap if it is worn out and check for the lines that goes to and from the gasoline tank.

Well, yes, the gas cap off can cause this problem. The quickest way to erase the code is to use an OBD-II Scanner borrowed from your local autozone or advance auto. The erase code button is used to accomplish the task.. pretty routine.

Sometimes the recirc line fitting can be cracked or worked loose and allow the same pressure loss. On the Impala I am not exactly sure how to get to them.

The OBD P0455 Code refer to Evaporative Emission (EVAP) control system gross leak detected.

its possible that you need a new Vent Vontrol Valve. The part # is 14935-am60a. It costs around $100.00

Hope help with this.

A code 455 most likely one or more of the following has happened
a loose or bad gas cap
a non-conforming gas cap
other leaks or damage pieces in the evap system

Inspect the evap system for cracks or breaks in lines listen for vacume leaks or strong gas fume smell and fix all lines you find that are damaged ..I know you say you put a new gas cap but make sure it a conforming cap..Hope this helps