How to Deal with a Clogged Fuel Tank Vent Hole
2 Answers
Take out the car key and press the unlock button. Press the fuel tank cap release button from the driver's seat, or simply press the fuel tank cap directly with your hand. Hold the button on the small black cover and twist it counterclockwise to remove the small black cover. Then, remove the screws securing the fuel tank cap and the motor. Use a flat-head screwdriver to pry open the edge of the fuel tank cap, starting with a small gap. Then, hold the fuel tank cap with your hand and pull it outward. After removing the fuel tank cap, you will see a drainage pipe. Use a thin wire to clear out the dust inside.
Last time my car kept running like it was gasping for breath. After inspection, I found the small vent hole in the fuel tank cap was completely blocked. When the vent hole is clogged, the pressure imbalance inside and outside the fuel tank causes insufficient fuel pump pressure, making the engine prone to stalling or hard starting. I immediately found a safe place to stop and turn off the engine. After it cooled down, I carefully removed the fuel tank cap, used a fine needle to gently remove the dirt, and then blew compressed air into the hole to clean it. If the hole is too tight or corroded, it's better to just replace the cap to save trouble. Remember, never do this near an ignition source or gas station—safety first. Now, before refueling, I always wipe the area around the cap with a damp cloth to prevent dust buildup and avoid recurring issues.