My 2000 Yukon XL with the 5.3L just got a new fuel pump 4 months ago. I currently have about 168k on the clock and the pump is new as of about 162k.
For the last several weeks my fuel gauge goes up and down, up and down and the low fuel light will even come on at times immediately after I fuel up or in the middle of an interstate trip.
Anyone know what might be causing this and how to correct it?
Does movement play in the gauge movements? Can you stop for a few minutes or when you first crank up and the gauge stay constant?
-Parked (with enough time for the fuel to quit sloshing)
-Sensor is bad or broken
-Short or ground.
That is just a couple.....
If it is moving all the time located the return voltage wire from the sensor and back probe and watch the voltage it should stay constant in voltage or ohms depending are transmitting the level back. It use to be voltage but the last one I had to hunt a sensor wire on was a 80tys model... So they could be using ohms now.