See related questions.
yes
In the gas tank. I have 2001 Echo.
2001 Toyota Echo doesn't have a timing belt.
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
3.5 Liters
see link
timing chain.
32 PSI
It's an easy job, details can be found here: http://groups.msn.com/Sorensonbrian/yourwebpage.msnw
It's electronic.