* The fuel cap may not be sealed properly. This is the most common cause of gas smells when filling up. Make sure the fuel cap is turned clockwise until it clicks into place.
* The fuel filler neck may be damaged. If the fuel filler neck is damaged, it can allow gas fumes to escape. This can be especially dangerous if the damage is near the fuel tank. If you suspect that the fuel filler neck is damaged, have it inspected by a qualified mechanic.
* The fuel tank may be overfilled. If you overfill the fuel tank, it can cause gas fumes to escape through the fuel filler neck. This can be dangerous, as it can increase the risk of a fire. Be sure to stop filling the tank when the gas pump clicks off.
* The fuel tank vent may be blocked. If the fuel tank vent is blocked, it can cause gas fumes to build up in the tank. This can lead to a gas smell when you fill up. The fuel tank vent is usually located near the top of the fuel tank. If you can't find it, consult your vehicle's owner's manual for help.
If you continue to smell gas when filling up your VW Vanagon tank, it's important to have the problem diagnosed by a qualified mechanic.
