See link to related question.
tow a trailer yesany vehichle should be able to tow a small trailer See related link for video of Toyota echo pulling trailer.
If you are asking if you can tow with a Toyota echo, the answer is yes. See related link for a video of a Toyota Echo towing a small trailer (and off roading).
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
No.
3.5 Liters
timing chain.
see link
32 PSI