Increased risk of fuel spills and slippery surfaces at the pump. When fuel reaches the opening of this switch, the flow of fuel creates a suction that closes the valve, stopping the flow.
Topping Off Fuel System Protection: Risks and Best Practices
Topping off involves forcing fuel past this mechanism, which is why the pump handle must be held down manually. Liquid fuel can enter the charcoal canister or evaporative purge system, which are designed to handle vapor, not liquid.
The optimal approach is to stop fueling when the pump automatically shuts off, even if the gauge indicates the tank is not visually "full. Fuel expands when it warms up; if you fill the tank completely, the warm liquid can expand beyond the tank's capacity, resulting in fuel spilling into the vapor return line or onto the ground.
Topping Off Fuel System Protection and Best Practices
Best Practices for Refueling To ensure safety, vehicle longevity, and cost efficiency, drivers should adopt specific refueling habits. 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.
More About What does topping off mean
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