 fuel gauge seems stuck at 1/2 (or should I say 2/4..), seemed fine a few weeks ago |
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| potomacmidget |
 Sep 24 2016, 09:29 PM
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#1
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I gotta have more cowbell....  Group: Members Posts: 161 Joined: 27-March 11 From: Maryland Member No.: 12,860 Region Association: North East States 
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Hi All,
filled up the other day and it appears that my gas gauge wont' budge past 1/2 full. Any ideas how to trouble shoot? Sender unit, float stuck, etc.? Any advice appreciated. Car is a 1971 D Jet - all original. thanks! Reg |
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| euro911 |
Sep 24 2016, 10:27 PM
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,845 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California
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The sender is basically a variable resistor that varies the voltage to the meter as the float moves up or down.
Look at the wiring diagram. If you have a VOM (Volt/ohm meter, or multi-tester), pull the connector off and jot down the the resistance readings at the prongs on top of the sender unit. IIRC, it should have less resistance when the float is all the way at the top, allowing full deflection of the meter when the tank is full. You can short the resistor terminals on the plug to simulate 'full' and 'empty' levels to determine if it's the gauge or the sender gone awry. |
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| RickS |
Sep 24 2016, 10:45 PM
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Senior Member Group: Members Posts: 1,408 Joined: 17-April 06 From: 'False City', WA Member No.: 5,880 Region Association: None |
Just had the same issue and was a bad sender.
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| Mblizzard |
Sep 25 2016, 05:11 PM
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Never under estimate the information that removing the sender and checking the operation can provide.
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| Dave_Darling |
Sep 25 2016, 11:36 PM
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#5
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The float is probably sticking on the wires in the sender. They can be CAREFULLY cleaned, or replaced.
There is also a failure mode of the gauge itself that causes the needle to stay at one point, but that is less common. Happened to my wife's 911 when we bought it, though. --DD |
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| michael7810 |
Sep 26 2016, 06:25 PM
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#6
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Senior Member Group: Members Posts: 1,078 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region
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Mine did that after sitting for 3 months. It fixed itself after a couple tanks of fuel.
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