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What is your question?
This problem occurs before I changed my oil then after changing after a few drives it read accurately. Took the truck on highway got a knock sensor error and the had gauge is back to acting up. When I start the truck it reads the current fuel level but after a minute into driving it slowly goes back down to e. I also have noticed a rattle in my gas pedal when accelerating it occurs around 30 mph
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Common problem on that generation of gm trucks,blazers etc.the fuel level sending unit on the fuel pump goes bad so the best fix is to replace the fuel pump assembly.ive done several n that fixed it every time