Gas gauge fix?
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Junior User
Joined: May 2017
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From: Pacific Northwest
Gas gauge fix?
69 f100
So when I fill up with gas my gauge only shows 3/4 full. I have ran it on E for 2 days just to see how long it will go, I ran out of nerve this morning
Is there an easy fix for this? The one star fix is to fill it up and bend the needle to full
Since I am new to bumpsides I though I would check with you guys and see if there is something easy I don't know about.
Thanks fellas!
So when I fill up with gas my gauge only shows 3/4 full. I have ran it on E for 2 days just to see how long it will go, I ran out of nerve this morning
Is there an easy fix for this? The one star fix is to fill it up and bend the needle to full
Since I am new to bumpsides I though I would check with you guys and see if there is something easy I don't know about.
Thanks fellas!
Logistics Pro
Joined: Mar 2009
Posts: 4,860
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From: Minnesota
Easy fix, not sure because it could be a bunch of things causing the problem. First, I would take the wire that comes off the top off the tank and ground it. This should send the gauge to full. If that is working correctly the next thing to do is to pull the sending unit out of the tank. You can then run the level by hand and see if it is working correctly. The float could be bad and causing the problem. That is the easy fix. If its a wiring issue, then it takes time to find the problem.
Thread Starter
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Junior User
Joined: May 2017
Posts: 96
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From: Pacific Northwest
Easy fix, not sure because it could be a bunch of things causing the problem. First, I would take the wire that comes off the top off the tank and ground it. This should send the gauge to full. If that is working correctly the next thing to do is to pull the sending unit out of the tank. You can then run the level by hand and see if it is working correctly. The float could be bad and causing the problem. That is the easy fix. If its a wiring issue, then it takes time to find the problem.
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
If you take the wire off the sending unit and ground it to make the gas gauge needle peg out, don't leave the wire grounded for long or you can damage the gauge.
If you have the fuel sender out on the bench with an ohm meter connected to it, it should read about 73 ohms with the arm/float in the lowest position (empty). You should get about 10 ohms with the arm/float in the up position (full). Half a tank should read about 44 ohms.
If it's not the float that's causing the low fuel level reading, it may be the ICVR on the back of the instrument cluster is out of adjustment. It has a small pot (potentiometer) on it to adjust the voltage regulation to the gauges. If you have to adjust it to get a full fuel level reading on the fuel gauge, you need to be sure you have a completely full gas tank before hand.
If you have the fuel sender out on the bench with an ohm meter connected to it, it should read about 73 ohms with the arm/float in the lowest position (empty). You should get about 10 ohms with the arm/float in the up position (full). Half a tank should read about 44 ohms.
If it's not the float that's causing the low fuel level reading, it may be the ICVR on the back of the instrument cluster is out of adjustment. It has a small pot (potentiometer) on it to adjust the voltage regulation to the gauges. If you have to adjust it to get a full fuel level reading on the fuel gauge, you need to be sure you have a completely full gas tank before hand.
Thread Starter
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Junior User
Joined: May 2017
Posts: 96
Likes: 0
From: Pacific Northwest
If you take the wire off the sending unit and ground it to make the gas gauge needle peg out, don't leave the wire grounded for long or you can damage the gauge.
If you have the fuel sender out on the bench with an ohm meter connected to it, it should read about 73 ohms with the arm/float in the lowest position (empty). You should get about 10 ohms with the arm/float in the up position (full). Half a tank should read about 44 ohms.
If it's not the float that's causing the low fuel level reading, it may be the ICVR on the back of the instrument cluster is out of adjustment. It has a small pot (potentiometer) on it to adjust the voltage regulation to the gauges. If you have to adjust it to get a full fuel level reading on the fuel gauge, you need to be sure you have a completely full gas tank before hand.
If you have the fuel sender out on the bench with an ohm meter connected to it, it should read about 73 ohms with the arm/float in the lowest position (empty). You should get about 10 ohms with the arm/float in the up position (full). Half a tank should read about 44 ohms.
If it's not the float that's causing the low fuel level reading, it may be the ICVR on the back of the instrument cluster is out of adjustment. It has a small pot (potentiometer) on it to adjust the voltage regulation to the gauges. If you have to adjust it to get a full fuel level reading on the fuel gauge, you need to be sure you have a completely full gas tank before hand.
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