I've repaired leak in purge line,replaced vent valve,new gas cap,but still have a problem leak.I removed filler neck.replaced cap and blew through backside of filler neck.leaked like it didn,t even have a cap on.I've tried multipal caps with same result.Is this normal?

not sure if thats normal, what specific code are you getting and which engine do you have? normally leaks are found by inspecting for rust holes, the gasket on the cap, throw some gas down the tube and see if anything gets wet, inspect the canister tubes. alot of times its the vent valve, but you replaced it.

codes 440 452 however i did turn key on with tank disconnected. I poured gas down tube and it came out from around cap,tried new cap with same result.

I guess what i'm asking is the filler neck to cap supposed to seal completely

its supposed to seal to were the cap seal seats on the threaded part

thanks i guess a new filler neck is in order

its leaking where the gas cap gasket is? that seems a little weird.

goes through as if it didn,t have a cap on it and i've tried 3 different caps.One of them i just purchased new.

I FOUND IT It appears there is a plastic insert in the cap end of the filler neck that the cap seals on.Air is leaking between metal neck tube and plastic insert.

good to hear