Posts Tagged: gas gauge
Fuel gauge wrong
My fuel gauge is wrong The fuel level sending unit is located inside the fuel tank. It has a float attached to an arm that rides up and down with your fuel level. The arm moves in an arc along a variable resistor that changes the voltage. In the old days, the dashboard fuel gauge responded directly to the amount of voltage it received from the fuel level sending unit. However, in late model vehicles, the variable voltage gets sent to a body control module (BCM) or generic electronic module … Read More
Fuel gauge isn’t working or reading wrong amount
How to diagnose a non-working fuel gauge or a gauge that’s wrong If your fuel gauge isn’t working or is reading the wrong amount, the two most common causes are a bad fuel-sending unit or a wiring harness issue. Here’s how to diagnose and fix the issue. How the fuel gauge works The fuel-sending unit consists of a variable resistor, a float, and a float arm. The fuel-sending unit is built into the fuel pump module. The float rides on top of the fuel. As the fuel level drops, the … Read More