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Why does it take several attempts to start the engine after refueling?

1 Answers

EmmettLee

07/30/25 3:32am

Taking several attempts to start the engine after refueling is likely due to vapor lock. Next time when turning off the engine, avoid shutting off the ignition immediately after pressing the accelerator; instead, let the engine idle for about ten seconds before turning it off. Vapor lock occurs when high temperatures in the fuel line cause gasoline to vaporize, creating bubbles. In other words, these bubbles of gasoline (not air) block the fuel line, leading to poor fuel flow, and in severe cases, causing the engine to stall. Below is an introduction to gasoline octane ratings: 1. 90-octane gasoline: Suitable for gasoline vehicles with an engine compression ratio below 8.5. 2. 93-octane gasoline: Suitable for gasoline vehicles with an engine compression ratio between 8.6 and 9.9. 3. 97-octane gasoline: Suitable for gasoline vehicles with an engine compression ratio between 10.0 and 11.5. 4. 98-octane gasoline: Suitable for gasoline vehicles with an engine compression ratio above 11.6.

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