Ready, mom? Now, on the pump side, things are much different. Beer me up Keep it simple or deck yours out with RGB lights, a touchscreen, and even a digital thermostat. You can see it in this diagram I highlighted from Methodology for Evaluating Fuel Nozzle Dispenser Characteristics , which is a real article:. The pipe is sucking in air via the Venturi effect , and when that little hole is able to just breathe in air, everything flows nice and easy.
Most commonly, the culprit is just some gasoline splashing back enough to block that hole momentarily, triggering the cutoff. Now, the question is why is it splashing back? In that case, you can try adjusting the trigger setting to a lower notch, or squeezing it less with your hand, or possibly angling the fill nozzle to give the little breather hole a better chance of not getting splashed or submerged by gasoline.
If none of that works, try another gas station that may have slower-flowing pumps. I guess if you were really, really desperate and had a real contempt for safety, you could maybe rig up a little snorkel device that would fit over the end of the nozzle and give the cut-off sensor an uninterrupted flow of air, no matter what.
Fuel tanks have venting lines that can get clogged or blocked; in cases like this, the situation caused by fuel back-up in the fill pipe can happen, since the clogged vent line will prevent rapid refilling, and that can trigger the shut-off valve.
So, there could be something wrong with the car, specifically, the vent line. You start walking everywhere. According to Jalopnik , it has to do with an abundance of caution. At the very tip of the gas nozzle is a shut-off sensor port.
A hole is connected to a pipe inset inside the fuel nozzle. The pipe takes in air. Thus, your refueling efforts are interrupted. The hole can be blocked as the level of gas in your tank rises, or even if a little splash-back occurs. When you first start pumping gas, the diaphragm is all puffed up and inflated, and air is flowing through the small tube.
Once the tip of the nozzle gets submerged in gas as the tank is filling up , gas starts getting sucked up into that little tube. When the little tube gets full of gas which, remember, is more dense than air , there is a pressure change in the pipe. Suddenly, in an attempt to even out the pressure, the air from the diaphragm gets sucked down and out of the pipe. Once the diaphragm decreases in size, it triggers the automatic shutoff within the nozzle.
An easy at home way to see the Venturi Effect is with a drinking straw. Think of what happens when you suck on a straw that's not in a liquid. The air flows through just fine - this is what the little tube inside the nozzle looks like when you first start pumping gas. Now cover the end of the straw. The straw starts to collapse as a vacuum is formed - this is what happens when the gas covers and starts getting pulled into the small pipe.
Its that vacuum that forms that pulls the air out of the diaphragm in the nozzle and triggers the automatic shutoff.
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