Sjekk ut denne linken:
http://www.ask.com/answers/155895361/how-do-i-take-a-gmail-account-off-of-my-android-phone-i-have-two-gmail-accounts-linked-to-it-and-i-want-to-delete-the-one-off-of-my-phone
eller prøv dette:
Go to Settings > Accounts. Click on your GMail account for sync on / off. It will take you to the sync settings in emulator. Then, click account settings, it wil show your mail again. Now, click on your GMail account. It shows all your account details. On dragging down, you will see remove your account button. Click it; you will be safe now.
Sync må først av, og så må du slette kontoen.