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Summary: Fixing a gas gauge first requires finding a wiring diagram to figure out which wires signal the gauge from the sending unit to the gas tank, which usually reveals a faulty sending unit. Find out how to fix a failing gas gauge with tips from an auto repair shop manager in this free video on car maintenance.
Brent Ferguson is the manager of Good Neighbor Shell and Auto Service in Nashville, Tenn.read more
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"Okay. Today, we're going to talk about the gas gauge. The gas gauge is critically important especially this day and age when everybody's trying to get the last drop of gas out of the tank before they have to spend money to refuel it. Okay. With that being said, we need to make sure the gas gauge is accurate. What I would like to see you do is fill the car up, watch the gauge, make sure it goes all the way to the top. At that point, we will know we'll have roughly 12 and a half gallons or so of gasoline in the tank, and that will vary between manufacturers and you may have to look in your owner's manual to find out the total capacity. Now, you want to drive until it's just about empty. Now, keep in mind, on this car here, I'm probably getting somewhere around 30, 32 miles per gallon, so you want to keep a close track of your mileage and try to make sure the gas gauge moves accordingly. If it does not -- if I've driven 350 miles and my gas gauge still reads full, now I'll need to start doing some troubleshooting. I'm going to start with the fuel gauge itself. Is it getting a signal? To do that, you're going to need to get a wiring diagram and find out which wires signal the gauge from the sending unit in the gas tank. Now, be careful with this one. A lot of the late model cars are activated by the BCM and it's all electronically controlled through on-board computers and data connection lines. So make sure you know what you're working on. This one on...here on the other hand, I've got a straight wire from my fuel gauge back to the sending unit in the gas tank. You would need to remove the instrument cluster and take a ohms resistance reading on that wire and measure that with what should be in the gas tank. If that reading is correct at the fuel gauge, you would then need to move toward the sending unit in the gas tank to find out why it's not operational. Chances are, you're going to find a stuck float or a faulty sending unit, but you need to go through the motions to test that before replacing any parts."
eHow Article: How Can I Fix My Gas Gauge?
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