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Discussion Starter · #1 ·
So I have an o6 envoy XL Denali and every time I fill my tank full of gas it shows empty and the check engine comes on. But when tank is about half the check engine goes off, keep in mind that I'm not constantly driving, but I really have no idea whats up, not sure if its a gauge cluster problem, maybe a sending unit problem, no idea! any suggestions?
 
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