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E10 in 2003 Corolla

My sister had a problem starting her 2003 Corolla Levin. The NRMA suggested it might be the fuel sensor, while her mechanic told her it was the fuel pump and it was caused by E10 fuel, and some of the fuel line was damaged and would have to be renewed. The car was running perfectly once it started. Could it be the E10?

Given that it runs well once started it's most unlikely that it's the fuel pump or damaged fuel lines as the mechanic has suggested. If it's a fuel problem it's likely to be a sensor that's not telling the computer how much fuel to inject into the engine at start-up.

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