# How To Check A Fuel Gauge Sending Unit

How To Check A Fuel Gauge Sending Unit. Check for incoming voltage to the sending unit. Disconnect the wiring connected to the sending unit of the fuel gauge and then look at the fuel gauge.

Fuel Gauge Sending Unit T1 68on from carolinadunebuggies.com

If you use the info in this post. you can test the output of the sending unit and determine where the problem is. Check to see if the sending unit is receiving power from the gauge. During the video is mentioned that the readings will v.

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Install the new gauge. reconnect the wiring and turn on the power. During the video is mentioned that the readings will v.

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Can anyone tell me how to check the ohms on a fuel gauge and sending unit. I have 12volt fuel gauge (street rod style) and a replacement sending unit that works on both 6 volt and 12 volt.

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Using your multimeter. check to see if the fuel gauge is receiving 12 volts of power. Quick video showing how to test a fuel sender unit.

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To test the sending unit. set your multimeter to ohms. Check for incoming voltage to the sending unit.

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Ask a helper to watch the fuel gauge. then switch on the ignition. 1/10 + 1/50 = 1/8.3 when the sending unit is at 10 ohms. the meter sees 8.3 ohms 1/73 + 1/50 = 1/29.6 when the sending unit is at 73 ohms. the meter sees 29.6 ohms that is. by putting a resistor in parallel with the sending unit. you can reduce the span of resistances that the meter sees. but you cannot increase it.

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Pull the sending unit out of the tank and attach it to an ohm meter. If your fuel gauge now reads empty then the sender is incorrectly grounded.

#### It Should Read Right At Empty.

The first thing you are required is to determine the problem with your fuel gauge. To test the sending unit. set your multimeter to ohms. The fuel sending unit is made up of an arm. float. and a resistor that changes.

#### Step 1) Test The Sender’s Voltage:

Subtract the number of gallons it takes to fill your tank from the volume stated in the owners manual. and youll know just how much farther you can go when the gauge hits empty. In some cases. it’s just the float that is broken. Install the new gauge. reconnect the wiring and turn on the power.

#### With The Engine Ignition On. Probe Using A Multimeter Between The Positive Terminal And The Ground.

1/10 + 1/50 = 1/8.3 when the sending unit is at 10 ohms. the meter sees 8.3 ohms 1/73 + 1/50 = 1/29.6 when the sending unit is at 73 ohms. the meter sees 29.6 ohms that is. by putting a resistor in parallel with the sending unit. you can reduce the span of resistances that the meter sees. but you cannot increase it. If there is too much less than 1 ohm. there is risk of damaging the fuel gauge coils. Testing the fuel tank sending unit to test the sending unit with your multimeter on ω x10. the unit should show approximately 1 ohm with the arm down (fuel tank empty) and approximately 9 ohms with the arm up (fuel tank full).

#### If All Of The Wiring Looks Good And There’s Not An Issue With The Fuse. You Have To Move On To Checking The Sending Unit.

I have 12volt fuel gauge (street rod style) and a replacement sending unit that works on both 6 volt and 12 volt. Disconnect the wiring connected to the sending unit of the fuel gauge and then look at the fuel gauge. Clip the test light to a good ground on the vehicle.

#### Most Times. The Wiring Is Bad.

On the other hand. if your fuel gauge is showing a full reading. it means the sending unit is faulty and due for replacement. The senders can work with both 12v and 24v system. This video explains how to test fuel tank sending units using the ohm setting on a digital multimeter.