It's actually not the nozzle per say. I consistently use the same gas pump at the same station and I can tell you filling up ALL three of my cars it can happen.

It's a combination of things, one the fuel in the tank in the ground, two the outside temperature, three how you stick in the nozzle.

All modern fuel systems are closed, and have multiple mechanisms to prevent bad things. But on much newer cars emissions has created highly aggressive evap systems. Basically the reason the pump switches off, the fuel vapors to "off gas" the tank can't escape fast enough causing the fuel to back up in the nozzle and then shut off the pump. What positioning the nozzle specific ways does is it allows the vapors to escape the fuel filler neck (which the evap is trying to prevent normally, CA hates when you let fuel vapor escape) as well as via the evap system. This is why its weather and fuel tank dependent. If the in ground fuel tank is older it has more vapor in it (as gas evaporates) and on hot days, there is more vapor in general.

My solution is on the pumps with a "metal ring" about half way up to the typical large plastic shield (If they are the nozzles with the wire wrapped around the end use that as the marker), I place this ring just outside the fuel neck opening, so my nozzle is pretty much the minimum it can be to not overfill (as in when it actually is full the auto kick off mechanism still works).

 

I have noticed this as well. I just rotate the nozzle about 45 degrees when filling up. That solves the problem.

 

Do you have to pull it out before it is done?

 

I was right on empty, and I figured I'd try the upside down thing.This station is the absolute worst for the nozzle clicking every few seconds.I got 3/4 of a tank before it started its BS tonight. Definitely a win 😁

 

I don't disagree with any of your points, I think they all contribute, but at the same pump at the same station to I filled up a 2024 Elantra without a single click until it was full, and even with the nozzle upside down, I only got 32L in before the filler neck backed up. I am certain the shape/angle of the C7 filler neck just doesn't agree with some pumps (in Canada the worst brands are Petro-Canada and Pioneer (usually use the same pump models), Shell and Esso/Mobil are better for me.

 

you have far more nozzle inserted upside down than i ever see with handle upright + i try to fill-up at 1/2 mark!!

 

The C7 could also be just not good at removing vapors. It's clearly a volume thing. And since the fuel system is closed, you have to alleviate pressure from the tank to get the liquid in. Vapor just moves slower than air as its denser.

 

when almost empty, which tank fills 1st??

 

Both tanks are emptied at the same rate as I understand there are two fuel pumps. So, unless there is a pump between them, the second one (passenger side) can't fill up until the driver side is nearly full.

 

Common issue, its the evap system. My 2019 had the issue from new, my 2016 doesn't have the problem. It is not gas pump related, its the car thats the problem but since they are all out of warranty it isn't worth fixing. I believe the fix is to replace the entire filler neck.

You either pump slower or try rotating the nozzle. I don't like to rotate on my '19 as I didn't trust it would shut off when full so I just pumped at 50% speed.

 

Not sure if I follow. Replace the filler neck with what? If I get the same, how would it differ? Or are you saying that it has since been redesigned?

 

Fractures, no good seal, hose damaged

, this graphic from the web describes a bit the problem, it's no particular to one brand or model

 

Has this happened to everyone else at one point or another? I must have filled up in at least 20 different gas stations all over the Bay Area and this never happened to me. I must have use most of the pumps if not all at my local Costco (even their passenger side pumps) without issues.

 

As I said happens in all my cars at some point. Every car I've ever owned.

CA gas might be less susceptible. It's expensive for a reason, unique blend. I think less "vapory"

 

I only have this problem if the gas pump nozzle has one of those vapor recovery outer hoses. The ones that are just the metal nozzle are usually not a problem.

 

That doesn't explain how I could have issues at a Costco pump, move to another pump and it is fine. Next time, I go back to that pump and it has issues. I think it is that particular pump or nozzle that is the issue.

 

That's just luck. Like I said I pretty much exclusively fill up at the same pump at one gas station (I'd say 90% of my fill ups are there I get 99% of my gas at this station), and sometimes totally fine, sometimes it has issues. So it's beyond a pump. It's with every car. So it's beyond just the car. It's a combo of things.

100% though its vapor/emissions related. That's why the weird handle positions work, they allow some venting through the spout, sometimes.

To have a fully controlled experiment (a DoE) would be impossible to many uncontrolled factors.

 

I will repeat - I have never, ever experienced this problem with my 2017 Z06.

I guess I'm just a lucky guy!

 

I use Shell in all my cars but shut-off syndrome only occurs on the Vette. A bit more than half the time.

I have only seen a single incident here of gas spilling onto the car but just to be safe I take a note of the "fuel used" reading prior to pumping.

The slow flow method has always worked for me.

 

I talked to a guy who was with a company that serviced gas station pumps. He said that when the pump constantly shuts off while pumping, that often means the solenoid switch in the pump is going bad and needs to be replaced.