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what is a shrader valve? my blazer has been to garge 3 times for check engine light. code p440. have had new vapor lines, new vent valve, now shrader valve? what is its function?
I got 440 code, had a smoke test done, repalced vapor lines. light came back on 3 days later with same p0440 code. had vent valve replaced. light came back on 2 days later. same code again... please help
I keep getting the 440 code. had vapor lines replaced after smoke test. light came back 3 days later. had vent valve replaced, light still came back on 2 days later. i fill up, i turn gas cap like 3 times to make sure it sealed. Please help!