1999 Chevy Cavalier fuel gauge doesn't regulate the amount of gas properly. What causes this?

if the car is fuel injected, holding the gas pedal to the floor will actually cut off your fuel injectors - which may make it worse. You need to check fuel pressure, you want to make sure the fuel pump isn't bad. Also, check your battery.

Hope this is helpful :-)

-Scott

Very common to see rusted and leaking fuel lines.Tanks have also been known to rust and leak

Sounds like you have a bad fuel pressure regulator.Take the vacuum hose off the regulator and look for fuel if there is fuel present replace regulator.But if you don't have in vacuum hose hook a fuel gauge up to fuel rail then start the engine look at reading on gauge now pull vacuum hose off and if pressure does'nt rise 5-10 psi replace pump.

Tank sending unit is bad.

you have a bad sending unit ,its inside the fuel tank,you have too drop the tank too replace it!!

Fairly common problem with GM vehicles. The sending unit in your tank has a small circuit board that an arm is attached to which moves up and down according to your fuel level. This circuit board and arm are not making good contact. Unfortunately the only good solution is to replace this part.

Hi

The most likely cause is that the fuel sender in the tank is faulty or that the wiring to the sender is bad.

Less common causes are a faulty fuel guage or circuit in the instrument panel.

Test the sender as it is the most likely cause and easiest to eliminate.

First inspect all connections that are readily visible to insure that they are secure & free from dirt or corrosion.

Disconnect the fuel tank sender wire at the tank. The guage should continue to show full (ignition on). Ground the wire from the sending unit at the fuel tank to any good grounding point on the car. The gauge should go to "Empty". If it does this is a strong indicator that the sending unit is at fault.

Hope this helps. Please do rate my answer. Thanks

The float is sticking in the fuel tank.Could be expensive if the float is part of the fuel pump.

The fuel pump as a gage sender that monitors the gage in the dash. I would replace the fuel pump .
Very common problem

Good Luck

Hi, this is being caused by a malfunctioning sending unit that is locate inside of the tank and is part of the fuel pump assembly. replacing the sending unit will fix this issue.

Please rate and god bless:)