Gas pump keeps stopping when I fuel up.

Got my waterpump issue taken care of, now i want to fix this annoying issue when i fuel up my tahoe. Gas pump keeps stopping often, takes about 15 or so minutes to pump half a tank of gas. 2011 LT Tahoe 5.3. Whats the first thing that i need/should replace??

Thanks!

vent tube is plugged or the fill tube is kinked. mine doesnt take that long but i cant run the pump wide open.

Saturated charcoal canister from too much topping off the tank. Ask me how I know. I replaced the vent line and the canister and solved the problem. I blew out the line when the canister was off by blowing air into the fuel tank from the filler tube.

Do you always gas up at the same place? I've wondered, before, if some pumps aren't maladjusted.

joe

It’s a multi step process to cure…

1st: Replace charcoal canister that likes to break its membrane and let pellets into the fuel system. YOU WANT to find it intact.

2nd: Replace vapor purge valve assembly under truck. If this stops the clickity clack of the filler nozzle, you lucked out.

If you have pellets falling out of the carbon canister or the purge valve assemb doesn’t fix it, there’s more steps. The two parts above are known to fail at 10+ years. Replacing them is a must regardless of outcome.

petethepug said:

It’s a multi step process to cure…

1st: Replace charcoal canister that likes to break its membrane and let pellets into the fuel system. YOU WANT to find it intact.

2nd: Replace vapor purge valve assembly under truck. If this stops the clickity clack of the filler nozzle, you lucked out.

If you have pellets falling out of the carbon canister or the purge valve assemb doesn’t fix it, there’s more steps. The two parts above are known to fail at 10+ years. Replacing them is a must regardless of outcome.

Click to expand...

Wrong order, parts cannon method. And we should use the correct terminology to minimize confusion.

First test the VENT (not purge; that's on the engine) valve that is under the backend of the truck. It should be open / vent with the key off / engine off while fueling. Adding fuel to the tank pushes fumes from the tank into the canister where the bad stuff is stored in the charcoal, and "clean" air is pushed out the vent valve. If that path is blocked in any way, it'll need to be cleared.

If the vent valve is working properly and the vent filter isn't plugged, open up the connections to the canister. If, when you pull the connections off the canister, charcoal pellets fall out of the canister or the lines, it's time for a new canister and having the lines blown out.

If you think you want more detail and a video or two to look at, let us know.

My 2010 Cadillac Escalade had a recall on it for this very issue, I had it fixed free from the dealer a few years ago, so check to see your Tahoe is on the list

The carbon canister is a parts cannon if it’s not replaced in time. Lucky to have discovered a huge known issue not usually discussed back in 2020.


Thanks for the heads up on the midnight nomenclature mix up.

I’d love to sick GM with the bill for my Carbon canister spewing pellets throughout the system. Have any info on a recall or trouble bulletin?

A few years ago I had my vent stuff replaced..... ( '05 5.3 ) But I still had the same issue at the gas station from time to time..... A few months ago, I replaced the purge valve ( top & front of injector manifold - easy to replace)...... My fuel problem is 90% solved.
( There were pellets in the valve intake )

Try holding the gas pump upside down while pumping your gas. This tends to help when I'm having trouble pumping gas to get the pump to not stop working