Pumping gas in my '18 SLT

[Golfguy1996]

Does anyone else hate pumping gas in their trucks? I don't know why but I can never set the auto switch on the pump and it STAY PUMPING. As soon as the pump gets fully rolling it shuts off. I've tried every angle and depth but it seems to always shut off. What a PITA. 

 

[1SLOW1500]

Sounds like a vent issue. Slide under and take a look!

 

[Golfguy1996]

Haven't noticed anything out of the ordinary. 

 

I should add that if I hold the pump manually it will pump fine...the issue comes when I push the auto switch down and let go, gravity pulls the pump down slightly and bam, shuts off. Different stations too. 

[aseibel]

That happens to me sometimes. I pull the nozzle out about 1/4" and then it works fine. But it sounds like you already tried that.

[Golfguy1996]

3 minutes ago, aseibel said:

That happens to me sometimes. I pull the nozzle out about 1/4" and then it works fine. But it sounds like you already tried that.

I've tried it all but I'll keep tweaking. Sure is annoying though! 

[kickass audio]

I have run into this problem at times too for the rare gas station that does have the levers setup. Most of the ones near me don't have the lever so you can keep the nozzle open and not hold it.

 

Sometimes it just happens with different pumps. I have had a few nozzles that were so sensitive that even at 1/4 of a tank it would shut off immediately. A little playing around and you can get it back to working again but usually you can't walk away from those overly sensitive pumps. Other ones I have had where they work as normal. I wouldn't sweat it, if it was with your truck then you would have an EVAP code.

[rivertrail]

I have the same issue on my 2016.  If I let it get really empty its worse so I try to fill up when I get to around 1/4 of a tank and it usually works fine.  

[14cris]

Ive had this issue too, i read on another forum to look under the fender and find the vacuum
Hose(black skinny hose) that runs from the evap to the filler neck, its held on by factory gm zip ties and causes a tiny kink, cut them off and re use your own zip ties but not so tight! It fixed my problem


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[Golfguy1996]

2 minutes ago, 14cris said:

Ive had this issue too, i read on another forum to look under the fender and find the vacuum
Hose(black skinny hose) that runs from the evap to the filler neck, its held on by factory gm zip ties and causes a tiny kink, cut them off and re use your own zip ties but not so tight! It fixed my problem


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I'll get under there and take a look. I can live with it but it's one of those "if I buy a $53k truck why can't I put gas in it" scenarios.

 

 

[14cris]

I'll get under there and take a look. I can live with it but it's one of those "if I buy a $53k truck why can't I put gas in it" scenarios.
 
 

I know what you mean, i got so frustrated one day and just started looking down there and reading on the forums and one guy said to follow that skinny vac hose and I noticed the zip ties with the gm logo and they were making a kink in the hose itself


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[L86 All Terrain]

1 hour ago, kickass audio said:

Most of the ones near me don't have the lever so you can keep the nozzle open and not hold it.

On a standard size gasoline nozzle, you can manually open it wide open and wedge your gas cap under the handle, fits like it was meant to do that. They are all still auto-kick off nozzles so you wont spill everywhere. Works nice in -30f. 

 

OP, there is a vent tube built into the filler neck, sometimes they get clogged if you have been off-roading or see dirt roads from time to time. On my old 2010 it had a filter off the EVAP canister that ran from the gas tank mounted EVAP can to the front of the truck, over the transmission and then dangles around there somewhere. The foam "filter" on the end of this sniffer hose was covered in dirt and dust, I removed it and washed it and never had fuel kick-off issues and my CEL went away when I cleared it. I haven't had any filling related issues with a K2 yet to have checked it out to thoroughly but I would imagine the set up is similar to the previous generation. Sometimes the factory plastic hoses or connections on the EVAP can, can come loose or crack. After cleaning the sniffer filter I replaced the factor lines/clamps with quality rubber heater hose and stainless hose clamps. 

[Golfguy1996]

4 minutes ago, L86 All Terrain said:

On a standard size gasoline nozzle, you can manually open it wide open and wedge your gas cap under the handle, fits like it was meant to do that. They are all still auto-kick off nozzles so you wont spill everywhere. Works nice in -30f. 

 

OP, there is a vent tube built into the filler neck, sometimes they get clogged if you have been off-roading or see dirt roads from time to time. On my old 2010 it had a filter off the EVAP canister that ran from the gas tank mounted EVAP can to the front of the truck, over the transmission and then dangles around there somewhere. The foam "filter" on the end of this sniffer hose was covered in dirt and dust, I removed it and washed it and never had fuel kick-off issues and my CEL went away when I cleared it. I haven't had any filling related issues with a K2 yet to have checked it out to thoroughly but I would imagine the set up is similar to the previous generation. Sometimes the factory plastic hoses or connections on the EVAP can, can come loose or crack. After cleaning the sniffer filter I replaced the factor lines/clamps with quality rubber heater hose and stainless hose clamps. 

You'd really be disappointed in the new ones then (at least my 2018)...no gas cap!

[L86 All Terrain]

1 minute ago, Golfguy1996 said:

You'd really be disappointed in the new ones then (at least my 2018)...no gas cap!

Yes, my 2018 6.0L has a cap-less filler. It's a bush truck too so it sees a lot of dust, was not impressed to learn about this feature a week after buying the truck. Hopefully someone makes an aftermarket plug by the time summer hits. Crawl around the evap can, that is usually where you will find an issue. You should not have to find a "sweet spot" to gas up your truck. The dealer would probably fix it for you under your B2B warranty if you can't find a problem. They will just charge you $40 to diagnose the issue if anything. 

[stassin22]

I only have this problem at certain gas stations and it aggravates the piss out of me but sometimes I can pull the nozzle out just a little and sort of cock it to the side and it’ll be fine. Just strange to me how I have only had problems with this at the same specific places


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[wforrest08]

2 hours ago, L86 All Terrain said:

Yes, my 2018 6.0L has a cap-less filler. It's a bush truck too so it sees a lot of dust, was not impressed to learn about this feature a week after buying the truck. Hopefully someone makes an aftermarket plug by the time summer hits. 

If by plug you mean cap? there’s a couple cheap options in this thread.