I have 2008 Ford Escape engine light come on check code PO 455 and PO457 and I smell gas inside car while driving.

This is an obd2 trouble code table, it can help you understand the meaning of code,
and for p0455:
Causes:
A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system
Possible Solutions:
With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
for p0457:
The only way a P0457 can set by itself is if the gas cap is left loose, assuming the van is in working order. when the engine controller sees a large increase in fuel level it knows you put some in the tank, and it runs the evaporative emissions system test to see if the system is sealed. If it sees a large leak it knows the cap was left off and sets the P0457. If you are positive the cap wasn't left even a little bit loose you may have a leak back there. It could be in the filler neck, from the tank to the evaporative emissions canisters just behind the subframe on the left side, and from there on up to the right front corner of the engine compartment where the purge solenoid is. If you don't see any leaks you probably have a bad NVLD, the unit that checks the system for leaks. This is probably what you are going to find.
The pressure or vacuum in the fuel tank when you remove the cap tells me that the system probably is sealed and has no leaks. Many times there will either be a little bit of pressure or vacuum in the tank, and it's perfectly normal.
The fuel gauge being innaccurate is either the sending unit or a problem with the pump module itself. there were some problems with some of the pump modules that allowed continuity between two of the terminals in the fuel pump connector and it caused the gauge to be wrong. You will probably end up needing to replace the fuel pump assembly for the gauge issue.
hope help.