This is the fuel composition sensor and is supposed to tell your flex fuel car what fuel it is burning. So, did you pick up a swack of water at your last fill OR The sensor may be bad
Not on a GM or a Chrysler It can be unplugged to make sure the fuel pump is working(On a Jeep Cherokee). But for spark, "This sensor cannot be bypassed; that sensor tells the pcm when to fire the coil. "
It relays bad info to the gauge. If you have a GM, it is probably what is wrong.
fuel level sensor located in the top of the fuel tank, can be purchased seperatly from gm
take it to a Chevy dealer, leave it and drive away with a new GM sensor, vehicle included
just google gm vats bypass kit
There is a fuellevelling sensor in the fuel tank, on the sending unit that is going bad. The sulfur in today's gas is messing up the sensor That sensor is about 150.00 from GM. dealer.
check your coolant temperature sensor
check the CKP sensor (crankshaft position sensor). It is usually used for injector triggering on 90's GM vehicles.
It is located behind fuel rails at top of transmittion where distributor was on older models
Could be a faulty pressure sensor. The pressure sensor on many GM vehicles is located on top of the fuel tank attached to the fuel pump/sending unit assembly. It can be changed with the tank in place if you can get your fingers on it. Unplug the wire harness from it and wiggle the sensor straight up and out.
In the gas tank and you can purchase it sepratly from gm for around 65 bucks