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Does the Fuel Pump Nozzle Auto-Stop Reduce the Amount of Fuel Filled?

1 Answers

McIsabel

07/29/25 10:14pm

Fuel pump nozzle auto-stop does not reduce the amount of fuel filled. Below is a detailed explanation of the auto-stop mechanism and why it doesn’t decrease the fuel quantity: 1. Principle of Auto-Stop: a. To prevent fuel overflow during refueling, avoid fuel spillage, and eliminate safety hazards, modern fuel pumps use self-sealing nozzles. When the fuel level approaches the nozzle tip, the airflow entering the nozzle’s intake port changes, disrupting the balance of the diaphragm inside the nozzle. This triggers the nozzle to stop fueling, resulting in the "auto-stop" phenomenon. b. During refueling, air in the fuel tank is expelled through the tank’s filler neck. Rapid air expulsion can create slight pressure on the nozzle’s sensor. If the pressure is slightly high, a sensitive nozzle may misinterpret the expelled air as fuel, assuming the tank is full and triggering an "auto-stop." 2. Reasons Why Fuel Quantity Isn’t Reduced: a. The "auto-stop" does not result in less fuel being dispensed than the amount displayed on the fuel pump meter. b. "Auto-stop" does not cause short fueling because the fuel quantity is measured by the flow meter in the fuel dispenser. Modern fuel stations use sealed dispensers equipped with flow meters at the nozzle. The amount of fuel dispensed is calculated based on the meter’s operation. The nozzle’s switch directly controls the meter—it only records fuel flow when the nozzle is open. During an "auto-stop," since no fuel is flowing, the meter stops counting.

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