Hi. I have a 2015 IS 350 F sport, I noticed over the last few months that when I go get gas, I start filling up, set the lever to fill automatically with no hands, and after 5-10 seconds, the pump stops. I tried different gas stations and it keeps happening. I have no lights on my dash.

Has this happened to any of you? What would you recommend? Car was purchased brand new July 2015, has about 10k miles.

 

Are you still able to fill the tank without Autofill after if shuts off?

Was there anything of note that happened a few months ago when this started happening?

If the autofill is clicking off early it usually means the tank isn't venting fast enough into the charcoal canister.
Of course I've never used the autofill...but in theory the same thing should happen if you manually hold the pump lever at max flow.

 

This has also started happening with my 2016 200T in the past few months. Nothing has happened with the car that I recall before it started occurring. Currently at 36k miles and it probably started around 32k

 

Depending on the gas station and how the pump sits on the gas tank, the auto-fill will automatically unlock resulting in me having to manual hold the lever like a peasant.

There has been threads on the issue in the forum and it seems to be a pretty common issue. It seems to me to be an issue with the angle of the gas tank opening which allows the pump to fall out easier

 

My 2019 has this issue too. Costco Gas, Chevron, you name it. Just gotta not put it all the way in and angle it a bit. I've even filled up manually straight in, pushed all way in and it still clicked thinking the tank was full. Angling and not putting it all the way does the trick.

 

There have been threads about this before, like this one: https://www.clublexus.com/forums/is-...0-f-sport.html

This is more than likely an issue with the specific gas pump/station you're using, but if you've tried different ones... I am not sure. The only way to know would be to see if how you angle the nozzle or how far in you're inserting it makes a difference.

 

I know with my Infiniti G37S, Infiniti issued a extended warranty for this issue because a lot of vehicles were having an issue with the pump constantly stopping thinking the tank was full. Might be the same issue in this case. I can't remember what the actual problem came down to and the fix that Infiniti was doing.

 

I've been having this issues as well, since I bought my IS200t back in march/april. It doesn't happen at every gas station, but a majority of them. It usually shuts off around half a tank, and when setting the auto fill it will keep clicking off. It's gotten to the point where even manually holding it, it will still shut off and i'll have to settle for the half-tank. It's very frustrating lol.

 

My 2014 IS 350 does NOT have this problem, fills just fine at every place I've been.
But my Jag (2007 XK) DOES have the problem at every place I've tried (I have to manually hold the nozzle and slowly fill it).
In researching the issue, it appears to be due to a clogged charcoal canister, and that is most likely due to overfilling the tank.
If you continue to fill your tank (after the initial shutoff on a normally working car), you risk getting fuel into the canister, which in turn will result in clogging the canister.
Replacing the charcoal canister (and perhaps blowing out the piping to/from it), is the only solution to the issue that I have encountered.
Best practice is to quit when the auto shutoff says to quit, and not attempt to squeeze in another gallon. That's just asking for trouble.

 

I've looked into the a while back.
The car is probably somewhat responsible.
However, the auto shut off valve on the fuel pump has some kind of regulator in there that is maintenanced.
My Nissan has this issue often ( and has actually popped out multiple times while spilling fuel....) and the Lexus occasionally.

I concluded the car was sensitive to this but the determining factor was the fuel pump its self having different setting or not being maintenanced.

I don't top off after it shuts off but I'm gonna look into that charcoal canister issue.

 

You pretty much hit the nail on the head.
Overfilling the tank does run the risk of getting gas into the charcoal canister.
I'll add one item to the explanation...the gas tank vents to the charcoal canister through a Vent valve which is located on the tank itself.
Sometimes the Vent valve is part of the fuel pump assembly, or sometimes it's separate....if the valve gets stuck closed, the fuel pump clicking off prematurely with happen also.
It's not often the valve gets stuck, and I've rarely (I mean rarely) ever seen it happen on a Toyota.

 

If the vent valve or cannister is compromised, which it may be if this is rare with Toyota otherwise, what corrective measures can we take do you know?

 

Can anyone who's had the issue confirm if they try to "top-off" the gas tank? I personally have never done this with my IS (as I learned several years ago that it's not a good idea).

 

Ultimately replacing them will fix it.
In the canisters case you have to replace it because the charcoal is saturated and there's no way to get the gas out of it.
With the vent valve, it's not really serviceable, but you could try to run cleaner through it and pray. But given the work needed to access it, you'd be putting a new one on.

 

Here's a question to everyone who is having the issue, when you remove the gas cap before fueling, do you hear the big "whoosh" sound? Like you're opening 6 beer bottles at once.
If so, that's a good indication that the tank is not venting properly.
I would add this one caveat, if you have a vehicle without any issues and drive it "aggressively" and then remove the gas cap, you'll also get that "whoosh" sound...so the whoosh test isn't 100% conclusive, just simply one indicator.
You have to imagine that is you drive "aggressively" the fuel in the tank gets sloshed around pretty good, which in itself churns it up with the air in the tank, thus increasing the pressure in the tank...so if you remove the cap right away, "whoosh".