The hardest part to this is actually getting the old ones out, since they're usually rusty. I did this by using an exacto blade to score and cut the old bushings, then, using a screwdriver and pliers, i hacked at the old bushings until you get enough out, top and bottom to get a hacksaw or saws-all in there to saw through the old linkage. Once you get the old ones out, installing the new ones is pretty strait forward. Remeber that the washers "cup" the bushings and the little lip on the bushings faces towards the sway bar and control arm, not facing the washers. The harderst part is getting enough room to fit the spacer on the bolt in between the sway bar and control arm, for this i used some scrap wood and levered the swar bar up. If the bolt is askew, meaning not perfectly vertical, you may need another piece of wood to push against the bolt as you tap it upward. Also I found cheap aftermarket links instead of the expensive ones from Toyota.
Good luck.
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
Two. See sources and related links below for more information.
3.5 Liters
I'm pretty sure there will be no fuel pump on the 20,000 toyota echo. Also pretty sure there won't be a 20,000 toyota echo. But if you want to check the fuel pump on a 2000 toyota echo, see related links and questions.
timing chain.
see link
32 PSI
According to my reference, there was no 2004 Toyota Yaris but there is a 2004 Toyota Echo. (The Yaris replaced the Echo in 2006). See sources and related links below.