The extra fuel that drips onto the ground or evaporates into the air represents unnecessary hydrocarbon emissions. This can cause damage to these components, leading to check engine lights and costly repairs.
Understanding Topping Off Valve Closure and Its Impact on Your Vehicle
However, for the average commuter, this is unnecessary. Liquid fuel can enter the charcoal canister or evaporative purge system, which are designed to handle vapor, not liquid.
These spaces at the top of the tank accommodate fuel expansion due to heat and allow for the necessary vapor space required for the evaporative emission control system. Topping off involves forcing fuel past this mechanism, which is why the pump handle must be held down manually.
Topping Off Valve Closure Science: Understanding Fuel Tank Vent Space
Potential for liquid fuel to enter the carbon canister, causing vapor lock. Furthermore, the energy used to produce the fuel that is accidentally wasted adds an unnecessary carbon footprint to the refueling process.
More About What does topping off mean
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