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Old 08-16-2013, 02:18 PM   #1
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Smile 1999 gmc sonoma 4.3 bouncy gas gauge needle

99 sonoma with a bouncin all over the place gas gauge. i have tested the pump and everything appears to be a very strong pump. i ran techron through it(same as dealer sells) hoping that would help clear up the issue.
im not exactly sure if the sending unit on this one is replaceable or not. any ideas?
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Old 08-16-2013, 09:40 PM   #2
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Yup, your sensor is worn out.

Just like this one...

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Old 08-19-2013, 08:59 AM   #3
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i also thought maybe it had a bad ground that wasnt grounding out
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Old 08-19-2013, 01:59 PM   #4
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on obs fullsize trucks, i assume its similar as the sender seems similar, the bushing wears out and causes intermittent opens. also if you get the new delphi, module they give you a new harness design to splice in. those are for the bouncing thats slower and goes from real reading to overfull. if its really fast commonly called the butterfly they found the grease thats supposed to suppress the needle fluctuation leaked out. mine is doing that now but i dont care enough to fool with it you can see how much gas is in it
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Old 08-19-2013, 03:10 PM   #5
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mine was like sit at full and come to a stop it will go to empty and fuel light comes on. then it will go to half then back to empty. most commoy stays at full tho
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Old 08-19-2013, 10:06 PM   #6
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If its the OEM unit, I say a case of beer its the feelers are worn out like in the picture(barely see it)
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Old 08-20-2013, 08:38 AM   #7
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ya just need to find time to fix the damn thinf! for now just been using trip odometer
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