If your tank gauge is at or below ¼, it is recommended that you order oil or gas … The CEL was gone, but the gas tank still read empty. Understanding how the gauge works and how to read the real level of gas in your tank can help you drive the farthest you can, even when the tank says empty. If The Gauge is Reading Empty … All the sudden, the Low Fuel light comes on and the gas gauge is showing empty. If it was just a broken wire, it would read empty instead. Then perform the same test as performed with the jumper we just talked about. Low Fuel light on and gas gauge showing empty on full tank. The gauge will show a small marker to indicate how full your tank is. Believe it or not, gas gauges were not found on the first cars. I know this is wrong because I just filled up two days ago and have hardly gone anywhere. I recommend having a certified technician, such as one from YourMechanic, determine the exact source of the fuel misreading and replace the fuel pump if needed. After flustering myself, I disconnected the battery for about 5 minutes, reconnected and started the car back up. Telling us that the gauge is operating properly and we have a problem somewhere else. You will likely need to drop the tank and replace the fuel pump altogether. The gauge is dead-empty at the 1.8 Ω reading. Start at the fuel tank. This time, the CEL came on as well as the gas light and the guage reading empty. I let it run for about 5 - 10 minutes and went back out to my car and the gas guage corrected itself. The resistance should be between the limits stated above (A half-full tank should be around 80-85 ohms). The fuel sender is a permanent part of the fuel pump, so that has to be replaced as a unit. SOURCE: 2000 Buick Century gas gauge reads full all the time. When the tank is full, the resistance decreases, causing more current to flow to the gauge, which moves it "up," or toward the FULL indicator. 93 Ω @ full 1.8 Ω empty I stopped there. So I was sitting at a red light this afternoon with my foot on the brake. A tank gauge is either a small glass cylinder or dial on the top or side of the tank. If reading is zero, the sender is shorted. Using an Ohmeter (or digital VOM): check the resistace of the sender (to ground), with the wire disconnected. Jul 13 2016, 10:27pm. The fuel pump itself may or may not be bad itself, but the pump and float are all part of the same module. Read your tank gauge. * fuel float full of fuel (very common) * blown F1 fuse on circuit board (very common) * bad connector on the sending unit plug (rare) * bad guage (possible) Once the repair was completed, I was able to obtain an OHM reading of 0.01 - 88.8 (empty-full). Remove the power and it should read empty. Make sure it's not shorted or open. Jump over to the sending post and the gauge should read full. It’s really all in the gas gauge and how it reads the gas left in the tank. Types of Gas Gauges. 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