I just replaced the left front balljoint on a 2000 echo. The balljoint had to be purchased attached to a frame assemble. Dealer part $300. Bargin Parts place $90.00 . Jack up the front of the car, support with jack stands, remove wheel . Remove two large bolts (one vertical, and one horizontal ) that hold the frame assemble to the frame. Remove small nut in the middle of the frame assemble that is attached the the stabilizer bar (or sway bar ). Remove the nut from the balljoint .Tap or pry the balljoint down out of the back of the brake assemble. With the balljoint now hanging down use a small pry bar to remove the entire frame assemble. When installing the new part finger tighten the VERTICAL Bolt first , then the HORIZONTAL Bolt then the stabilizer and last the Balljoint nut. Then go back and tighten everything up. DoNot forget the cotter pin in the Balljoint nut. Be careful not to bump the axle as it can fall out of the tranny, be careful not to damage the boots .
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
see link
See related link
yes
In the gas tank. I have 2001 Echo.
http://groups.msn.com/Sorensonbrian/fuelfilter.msnw follow this DIY
See related answers, its already been answered
2001 Toyota Echo doesn't have a timing belt.
I very much doubt you can buy that on it's own. It usually comes only with a balljoint.
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
Look in the trunk, there is cover for the brake light, remove and you will have access to change the bulb.
3.5 Liters