Have a 2004 Avalanche, Problem filling up with fuel. keeps shutting Station Fuel Pump off and takes very long time to fill. Cap is hard to twist off. Trouble shooting states Replace fuel / EVAP canister,vent valve,vent valve and purge valve.

try 2 station pumps???
if 2nd pump fails, all the 800- number on pump , says call for complaints....
2 pumps fail. (2 island pumps)
are you sure the DASH gauge reads right, some dont.
test the tank fill with dip stick , like all smart aircraft owner do.
we never fly trusting any freakn gauge on dash. (John Denver rules, RIP)
we dip it. (mil spec rules on C130 too.)

Did you run the trip meter,,?? if you had, you'd have known
the gauge was fibbing, say it didnt go 300 miles?
10gal, 30mpg, is 300 miles...

tell more get more...

The fuel cap won't make a difference as the fuel cap is off when filling with fuel.
This is quite common with a number of vehicles, yet not necessarily anything to do with any fault of the vehicle, as it may simply be the sensitivity of the fuel pump nozzle. If the vehicle is otherwise operating normally, then I would suggest that there is no issue with it.
I would instead try angling the fuel pump nozzle or withdrawing it slightly, but not all the way out when filling with fuel.

HI Bridgette,

Due to the different shapes of fuel tank filler necks in cars & trucks, it may be necessary to vary one or more things to allow fuel to flow uninterrupted until the tank is really full.

The main problem can come from the new "vapor recovery" gasoline pumps. These pumps and hoses actually recover gasoline fumes from your tank as the liquid gasoline displaces the air / fumes in the tank is it is being filled. If gasoline flow is started at full blast, it can splash back slightly, causing liquid to be pulled back by the pump - so it shuts off. So, start with a slow rate of filling and gradually increase flow rate to maximum over 5 to 10 seconds. If it still shuts off, try some of the suggestions below.

First, don't fill at maximum flow rate from the pump - that is, don't set the nozzle for wide open. Select one of the other "latches" on the handle instead of the fastest flow and let the tank fill entirely at this rate.

Second, you should experiment a bit with the length of nozzle that you push into the tank's filler neck. If you push it in too far or too little, the pump nozzle can do what you're describing.

Third, try twisting the nozzle slightly so that it doesn't hang straight downward - a little to the left or right may provide a solution.

Lastly, try a different gas station. Their pumps may not be so picky with your tank's filler neck.

Good luck!

The reason the gas station pump shuts off is when the fuel reaches the tip of the gas nozzle, so when you are filling your car and the gas nozzle (gas stations pipe) keeps shutting off it means that the pipe that runs to the gas tank is not open completely, what happens is when you pump the gas in the car the supply pipe from the gas tank opening to the tank fills up quickly and this causes the gas station pipe nozzle to shut off, have some body take down the gas tank and have a look at the gas tank opening and also gas supply pipe that runs from the gas filler opening ( on the car body) to the gas tank. Have a look at it and please don't forget to rate the answer if it was helpful, thanks!

some prefer a name brand although I always fill up after 8 AM in the morning at my local station. The reason is the tanks are filled at 7AM at the station I go to giving me the satisfaction no moister from a very low underground tank will get into my gas tank when I fill up. All fuel tanks receive moister in their tanks. The tanks are electronicly read from inside the filling station. They have alarms that sound if too much moister is inside and shut the picticular tanks pump down. Some times they do not shut down for many reasons. One is a over ride switch incase that tank is the only one left with fuel in it especially on a holiday weekend. It has happened to me a few times causing my car to throw codes from the computer and also stalling out a few miles from the gas station after filling the vehicle up. That is why I choose to fill up mine after the station gets their fill up

Two things come to mind. You broke the pressure seal to the fuel system when you took off the gas cap. The fresh gas rushing in disturbs any dirt or debris on the bottom of the tank.
Next time you use the car when you arrive at our destination, simulate what you do when you fuel up. This will mimic everythig except the new fuel rushing in. If it is still hard to start you know it's something to do with the evaporative fuel system. If not, you need the fuel tank inspected .

Just helped a friend fix this exact same issue on his 2004 hyundai santa fe. Replaced the purge control valve - a $39 part, even from the dealer. Had to get our hands dirty, but it took literally one single hour to replace the part. Filled it up immediately afterward and no more starting problems. Part is located directly behind the manifold - top, rear of the engine compartment - just between the engine

your charcoal canister has came apart and blocked the fuel vent system

There is a breather tube fitted to the tank which allows air to escape when you fill it with fuel.

That is either blocked or compressed.

When you take the filler cap off is there a gust of air in or out of the tank

i would check the filler rubber hose betewn the tank
and the filler hole , may have a bent in the hose
or the vent is block .