Originally Posted by DGajre777
The 'HISS' sound will come from a pre-vent/vented gas cap. If you don't have a vented gas cap, you won't get that sound since it doesn't release fuel vapors prior to being opened. My Talon didn't have a vented gas cap.
I bought a regular cap last weeK. I do not think is pre-vented. I am asking because I am trying to fix a problem with the evap circuit. I check the voltage on the ecu to see if the Canister selonoid for the Evap was being grounded. The Volt reads about 13 V but never ground(never goes to 0). I got another ECU thinking that was the problem, but same thing happens. I am getting a P0446. I check all the vacuum lines, the canister, replace the solenoid and the purge valve, the ECU but still get the code. Therefore, I thought that maybe I have a vapor leak form the tank or the hoses but everything looks OK. No small of gasoline anywhere.