Fuel System Charcoal Canister Replacement - How To - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67HEAVEN · 08-22-2010, 06:38 PM

My 2004 Z71 Tahoe developed the irritating habit of not allowing me to fill the gas tank without endless click-offs as if the tank were full. It would take 15 minutes to fill the tank if it was nearly empty.

And, from time to time I'd get the check engine light with a P0449 code on my reader.

So, following some research, I determined that the culprit was the VALVE, Evaporative Emission Canister VENT SOLENOID located just above the rear differential near the rear of the gas tank. That's the black canister just to the right of the tailpipe.

It's #2 in this drawing. The arrow on the drawing points to the front of the Tahoe.

This is a new one.

The part numbers: ACDelco # - 214-2149 GM# - 25932571

After soaking the slide-on bracket with Release-All (that's the liquid you see), I was able to work it loose. It's hanging by the hose in this photo. The place it was mounted is directly above it and slightly to the left.

Here is a view showing it above the rear diff.

After removing the canister, you can see the hose and the wiring harness. Both were attached to the canister with clips. The wiring clip was easy to remove. The hose clip is a little harder to get to and a bit stubborn. Also, the location doesn't help. I wouldn't want to try this without my new hoist.

After taking the old one apart, I found nothing but a charcoal filter and lots of gray (grey?) coloured dust inside.

So, what was the result? As soon as I got the new canister installed, I went to the local gas station and pumped $75 worth into the almost empty tank...full blast....and it didn't click off once until the tank was full.

Yeah!

67HEAVEN · 08-24-2010, 09:33 PM

Hello? Hello?

Is this mic on?

KEL · 12-16-2010, 10:28 AM

My 08 Silverado is doing the same thing.
I just figured it was the gun or a tight bend
in the filler hose to the tank. I had to wait
until mid December to read this ???? Guess
I'll have to try this anyway.
Thanks for the info.

Jacfourteen · 12-19-2010, 04:30 AM

Good info, now I know what to look for if mine acts up.

08-22-2010, 06:38 PM	#1
67HEAVEN www.67HEAVEN.com Join Date: Oct 2007 Location: SouthCentral Ontario Posts: 625	Fuel System Charcoal Canister Replacement - How To My 2004 Z71 Tahoe developed the irritating habit of not allowing me to fill the gas tank without endless click-offs as if the tank were full. It would take 15 minutes to fill the tank if it was nearly empty. And, from time to time I'd get the check engine light with a P0449 code on my reader. So, following some research, I determined that the culprit was the VALVE, Evaporative Emission Canister VENT SOLENOID located just above the rear differential near the rear of the gas tank. That's the black canister just to the right of the tailpipe. It's #2 in this drawing. The arrow on the drawing points to the front of the Tahoe. This is a new one. The part numbers: ACDelco # - 214-2149 GM# - 25932571 After soaking the slide-on bracket with Release-All (that's the liquid you see), I was able to work it loose. It's hanging by the hose in this photo. The place it was mounted is directly above it and slightly to the left. Here is a view showing it above the rear diff. After removing the canister, you can see the hose and the wiring harness. Both were attached to the canister with clips. The wiring clip was easy to remove. The hose clip is a little harder to get to and a bit stubborn. Also, the location doesn't help. I wouldn't want to try this without my new hoist. After taking the old one apart, I found nothing but a charcoal filter and lots of gray (grey?) coloured dust inside. So, what was the result? As soon as I got the new canister installed, I went to the local gas station and pumped $75 worth into the almost empty tank...full blast....and it didn't click off once until the tank was full. Yeah! __________________ www.67HEAVEN.com 2004 Z71 Tahoe 4x4 5.3L (factory white monochrome theme) 1989 Silverado K1500 4x4 5.7L sportside (white monochrome theme) 1967 Belair 2-door-post (project) 1967 Corvette 427/435 coupe (now 502/502 red road warrior)

12-16-2010, 10:28 AM	#3
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 535	Re: Fuel System Charcoal Canister Replacement - How To My 08 Silverado is doing the same thing. I just figured it was the gun or a tight bend in the filler hose to the tank. I had to wait until mid December to read this ???? Guess I'll have to try this anyway. Thanks for the info.

12-19-2010, 04:30 AM	#4
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Fuel System Charcoal Canister Replacement - How To Good info, now I know what to look for if mine acts up. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

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08-24-2010, 09:33 PM	#2
67HEAVEN www.67HEAVEN.com Join Date: Oct 2007 Location: SouthCentral Ontario Posts: 625	Re: Fuel System Charcoal Canister Replacement - How To Hello? Hello? Is this mic on? __________________ www.67HEAVEN.com 2004 Z71 Tahoe 4x4 5.3L (factory white monochrome theme) 1989 Silverado K1500 4x4 5.7L sportside (white monochrome theme) 1967 Belair 2-door-post (project) 1967 Corvette 427/435 coupe (now 502/502 red road warrior)



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