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Re: Fuel guage does not work 1999 Chevy Tahoe
The 100% for sure cause of this problem is the sending unit for the fuel guage, it is located in the gas tank. U may have to replace the fuel pump module to get the sending unit, as a rule they are one piece, if u have over 100,000 miles that is a good idea anyway.
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Could be the pressure regulator on the fuel rail. Pull the vacuum line off the regulator and check it for fuel contamination. There should not be gas in the line. If there is fuel in that line the regulator is bad and needs replaced.
You don't say if you have checked anything else. It could be any number of issues. I would look into either the crank sensor or the ECM as possible failures. Did you have any Service Engine Soon lights recently? Have you had the ECM checked for any stored trouble codes?
i would first try to replace the fuel filter.usually there filter accumalates debris in the gas tank especially if you you ru the tank close to empty.filter location needs to be traced from the tank toward the motor.you will see a cylinder inline with a strap.part usually runs around 20.00. also when you initally turn the key before start you will hear a hum for about 2 sec. this is the fuel pump pushing the fuel up to motor.so if you hear this pump is working.
Your fuel pressure can be checked by connecting a fuel test gauge up to fuel test port which will be located on the fuel rail at the back of the engine on drivers side next to the distributor.Your fuel pressure should be 60-66 psi with key on engine off.If its not within these specs then replace the fuel pump and filter.
it sounds like the speed sensor is faulty,but you should have it checked in case it is an output or input sensor too.whats happening is, since the computer has no eyes it totaly depends on sensors to know what is happening,if it sees no speed it won't up shift the transmission because it thinks your sitting still.