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2004 Impala SS Fuel filling problems
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fastrunner08
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PostPosted: Sun Jan 20, 2013 12:01 am    Post subject:  2004 Impala SS Fuel filling problems Reply with quote

Hey everyone,

Here is one I have never encountered before. i can't fill the tank up at the gas station. every time in pull the trigger on the nozzel it just shuts off as if it were full. Even if i try to hold the lever and keep the flow rate of the gas super slow it still shuts of on me. This makes filling the car extremely annoying. Any ideas what would cause this or how i can fix it?

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00impala123
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PostPosted: Sun Jan 20, 2013 12:16 am    Post subject:   Reply with quote

Me and gotitforcheap had the same problem.

He said he traced his down to a pinched vacuum line, iirc.

I haven't figured mine out, but it only happens when the tank is super low, so I make sure to fill up before i hit 1/4 tank. Haven't had a problem in a long time

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PBnj
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PostPosted: Sun Jan 20, 2013 1:14 am    Post subject:   Reply with quote

I've also heard of bugs building nests in the filler tube
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Frank4202
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PostPosted: Sun Jan 20, 2013 4:00 am    Post subject:   Reply with quote

Ill be keeping an eye on this thread. I have the same issue with my 2004 3.4L

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Ironjoey
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PostPosted: Sun Jan 20, 2013 4:10 am    Post subject:   Reply with quote

I've had that problem a few times. It seems like a station-specific issue with the gas vapor recovery style nozzles. I've noticed that if you rotate it a little to the left or right, it works regularly. I think it is the location of the ribbing inside the filler tube, sending feedback to the nozzle sensor. Rotating the nozzle reduces the feedback to that sensor.

That's been my experience anyway. Only happens at some stations.
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fastrunner08
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PostPosted: Sun Jan 20, 2013 12:14 pm    Post subject:   Reply with quote

Ironjoey wrote:
I've had that problem a few times. It seems like a station-specific issue with the gas vapor recovery style nozzles. I've noticed that if you rotate it a little to the left or right, it works regularly. I think it is the location of the ribbing inside the filler tube, sending feedback to the nozzle sensor. Rotating the nozzle reduces the feedback to that sensor.

That's been my experience anyway. Only happens at some stations.


i thought that at first too, but i have tried multiple stations in multiple cities and have had no luck.

Some told me to try replacing the back evap canster which i did try to no luck. I think im going to try taking the filler neck of next and seeing what is wrong

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98ss
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PostPosted: Sun Jan 20, 2013 12:30 pm    Post subject:   Reply with quote

Try changing the vent valve, or purge vent/valve which is above the driver rear wheel well.
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fastrunner08
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PostPosted: Sun Jan 20, 2013 9:02 pm    Post subject:   Reply with quote

i changed the one above the rear wheel is there another one somewhere else?

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bigdog60
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PostPosted: Sun Jan 20, 2013 11:56 pm    Post subject:   Reply with quote

Theres one up on the engine. I guess you tried pulling the nozzle out a bit while filling?

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PostPosted: Mon Jan 21, 2013 1:07 am    Post subject:   Reply with quote

I second the vent valve solenoid or purge valve solenoid. My friend has a subaru which is difficult to put gas in so I have been researching the cause of this the past few days.So far what I have learned about EVAP is basically the gas tank has a purge solenoid to release fuel vapors into the throttle body and a vent solenoid opens to the atmosphere. When the car is shut off the vent valve is always open meaning there is no pressure in your gas tank, but if one of these is remaining closed the tank cant release the air displaced by fueling up.

Here is a video about the EVAP system that might explain better.

http://www.youtube.com/watch?v=Dfj-F_pTj5M

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PostPosted: Mon Jan 21, 2013 11:45 am    Post subject:   Reply with quote

The vent valve or the evap canister would be the most likely culprits. I would check to see if you can blow thru the vent valve and the charcoal canister. Wouldn't be the first time any of us have seen a brand new part go bad. The other thing to consider is that the filler neck itself is bad, see if the anti siphon device is way lower than it should be. Could always take out the filler neck and remove that flapper piece.
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fastrunner08
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PostPosted: Mon Jan 21, 2013 12:00 pm    Post subject:   Reply with quote

well this is a good starting point. I'm going to see if i can find any of this wrong on the car. Does anyone have a diagram of where the different things are?

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habermehl
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PostPosted: Mon Jan 21, 2013 12:22 pm    Post subject:   Reply with quote

fastrunner08 wrote:
i changed the one above the rear wheel is there another one somewhere else?


they would've threw a cel was there a check engine light?

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how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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fastrunner08
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PostPosted: Mon Jan 21, 2013 1:09 pm    Post subject:   Reply with quote

there was for a day, but it went away, and still no luck on filling it up.

Is there a way to take these solenoids out and try to fill them out and see if it will fill properly to track the probelm? or would this lead to other issues?

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PostPosted: Mon Jan 21, 2013 7:56 pm    Post subject:   Reply with quote

If you want to go that way, just pull the hose off the rear evap valve...the one going to the gas tank to see if it will fill.

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