There are two main parts to a fuel gauge: the sender and the gauge. The sender is a float that is in the car's gas tank. The sender tells the gauge how much fuel is left in the tank, and this information is displayed on ... More »

Fuel gauge problems are commonly the result of faulty electrical grounding at the tank or a problem with the sending unit inside the tank but can also be caused by faulty wiring or a bad fuse. Troubleshooting the problem... More »

Check the pressure of a vehicle's fuel pump by hooking a pressure gauge to the fitting of the fuel pump, having an assistant rev the engine and checking whether the pressure matches the vehicle's specifications. Eliminat... More »

A vehicle fuel level indicator uses two components: a sending unit in the fuel tank, which measures the level of liquid through electrical resistance, and a fuel gauge that displays that level on the vehicle dashboard. S... More »

Check the pressure of a vehicle's fuel pump by hooking a pressure gauge to the fitting of the fuel pump, having an assistant rev the engine and checking whether the pressure matches the vehicle's specifications. Eliminat... More »

To check electric fuel pump pressure in a Ford F150 pickup, test the engine with starter fluid, connect a fuel pressure gauge to the Schrader valve, have a helper crank the engine, and look at the reading on the gauge. T... More »

To reset the oil change light on a car, turn the vehicle's ignition on, and press the Reset stick or button usually located on the dashboard, under the hood or close to the fuel gauge or speedometer. Then, switch off the... More »