2015 regal turbo premium 1 gas gauge problem

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ThEwAy2b

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Buick Regal LS
It's not the gs, but with the gs engine? Anyways anyone have problems with the fuel gauge sticking? Worked fine previously, but now when I fill it up to the brim it still only shows at 3/4 tank.
 

MelsRegal

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Regal GS 2017
try a bottle of Techron Complete Fuel System Cleaner, black bottle. There was a similar issue mentioned on a Corvette forum where sulfur deposits on the sender unit caused incorrect readings and a bottle of Techron cleaned off the desposits.
 
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