Evap Help Needed

Kinja'd!!! "Diesel" (wetfeet)
04/27/2016 at 10:28 • Filed to: None

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I need the assistance of someone familiar with Chevy Tahoes. My EVAP system has been causing me nightmares lately. I had an engine code of P0445/P0446 and ended up replacing my charcoal canister, and purge and vent solenoids. That resolved the engine code, but when I go to fill up, I am lucky if I can put a gallon in. And, I’m talking about when my tank is straight up empty. The charcoal canister was leaking pellets out of the large hole, pictured on the right here. I think that some of this got into the line and blocked it. So, that when I go to fill up, there is nowhere for the pressure to go but back up the fill tube. So, if I disconnect right where the pellets were falling out, open up my fuel cap and use a shop vac to suck out the pellets, do you think this would resolve my problem? Or, do I need to drop my fuel tank and replace the vent lines?


DISCUSSION (6)


Kinja'd!!! LongbowMkII > Diesel
04/27/2016 at 10:38

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Not being a smartass, but could you smack the lines with a hammer to dislodge it? Probably inaccessible, but that’s my inexperienced, half brained thought.


Kinja'd!!! Diesel > LongbowMkII
04/27/2016 at 10:41

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I probably could, but the line in question goes up to the fuel tank and is mostly inaccessible. Plus, I think I need to get the charcoal bits out of there to unblock it.


Kinja'd!!! wkiernan > Diesel
04/27/2016 at 10:46

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I’ve got an ‘05 Silverado at work that, when you go to fill it up, you have to pump in the gas v e r y s l o w l y for the first two or three gallons. For some gas pump nozzles it is almost impossible to get it to go slowly enough. But once I get 2-3 gallons in I can pump in the next 18 gallons at a regular rate. Have you tried slowly trickling in a couple of gallons?


Kinja'd!!! kanadanmajava1 > Diesel
04/27/2016 at 10:48

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If you don’t want to see an exploding vacuum cleaner do not try that method. If even some of the flow goes through the motor it will be enough the to ignite the bomb. I have heard that it look pretty interesting though...


Kinja'd!!! Diesel > wkiernan
04/27/2016 at 10:56

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There’s nowhere for the pressure to go when I fill up the tank, so that it actually will spit gas up out of the fill hole. I have gotten the tank to about a quarter full and it still doesn’t help.


Kinja'd!!! hubert07 > Diesel
04/27/2016 at 11:25

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My experience is with escalades, but confirmed '14 and back needs a vent valve kit, and this issue will be resolved