Other Fuel System Tank Assembly problems of the 2001 Chevrolet Blazer

Any time I am driving my fuel gauge goes crazy. I never know how much fuel I actually have because it constantly goes up and down. I've ran out of gas a few times because it shows I have 1/4 tank or more and then it'll just go down all the way, then shoot up 3/4 tank and so on. When I'm coming to a stop, especially in small downhills, my brake pedal starts vibrating and barely slows down. I get nervous all the time because I'm afraid my car will not stop. It also does this if I'm starting to brake, and one of the wheels hits a small bump in the road, then it's almost impossible to brake normally because the brake pedal starts vibrating, the abs brakes light comes on, and my car will not slow down which is very scary especially if I have my 3 year old in the car.

Fuel lines rusted and leaking above fuel tank. Leaking fuel lines tank area replaced both ruel lines rear of truck by Chevrolet dealership at a cost of $802. 69.

Gas gauge was inadequate. Has ran out of gas twice. Had sensors and clusters changed. Problem still exists. Dealer contacted. Upon talking to representative there was nothing to be done, but try to keep fuel in vehicle above half tank. General representative stated problem with program in vehicles.