Sounds like you need to replace the level sender. Usally if they start to fail they fail on the low end so you don't run out of fuel. It should be easy to replace but you probably just cant by the sender and will have to buy a whole fuel module.
Green 2000 SVT #1166
mods-K&N and Custom heat shield, optimized y pipe, Magnaflow center resonator, DMDhttp://www.geocities.com/savinoss/Cars.html
-Wifes car 99 Mystique V6 5 spd
