Cel that I can not figure out

[WRXWGN]

So here's the deal I have had cel  PO422 and PO457. The first thing I checked was the gas cap(I even bought a new one from Fastone) I checked the wiring to the charcoal canister everything looks fine. I checked the gas filler pipe and does not look bad.I can reset the code and drive about 40 miles before it comes back on. Anyone else have this issue and what was your resolution.

[KA_Killuh]

Hook it up to a smoke tester.  Capitaland has one 

[WRXWGN]

Yeah that may be the next thing I try just have to have the time to stop down there.

[wrathc5525]

i had the same problem replaced gas cap and solved problem. i didnt have the $100 for a smoke test. i just started at the cheap common spot gas cap and charcoal canister. then again i can get both of em from work for pretty much nothing.  knock on wood no cel after gas cap replacement

[skyphix]

I dont know if your charcoal canister is behind the rear passenger tire but check the lines there for rubbing.