Toyota Repair: replacement of Fuel Filter and engine check light come on, toyota camry, vacuum hose

Question
toyota camry le 2000 4cyl.  My engine check light come on when I start the engine and stay on.  Trouble codes are P0440, P0441 and P0446.  I replaced the damage vacuum hose, check the gas cap and clear the codes.  After a few days of driving the engine light come back on again.  What should I do next?  I also want to know how to change a fuel filter.  I knew a lot about how to fix an aircraft and now I want to learn how to fix a car.  Need some tips.  Thank you.  

Answer
they are all evap codes.
you have a leak somewhere.

check along side the airbox and make sure nothing is disconnected.
Ive seen the VSV on the charcol canister go bad. You need a scan tool to "active test" it.
Could be worth it to pay a diag charge to check it if you dont have access to a scan tool.
You can still fix it yourself and save some $$


Mike