slow filling

carluver63 · November 13, 2016

2005 Avalanche 1500. very slow fill of fuel. I have replaced the vent solenoid and the problem continued. To test it, I completely removed the canister and the purge valve, but the fill is still very slow. When i pulled out the cannister, charcoal came out of the fitting on the cannister. Any thoughts on the cause?

Coby7 · November 13, 2016

The cause is easy, overfilling the tank and you ended up filling the EVAP canister. Check your filler neck for a kink or an obstruction. If you remove the vent valve gas should flow in uninhibited.

kstruckcountry · November 13, 2016

The evap charcoal "tank" probably needs to be replaced.

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carluver63 · November 14, 2016

I was thinking it had to be the canister, but the problem continued with the canister completely removed from the truck.

Any other ideas? I am out of ideas.

kstruckcountry · November 14, 2016

I would check the line from the tank to the canister. It sounds like it's not letting any vapor flow. It might be good to check the filler neck too.

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Anthony Waggott · November 17, 2016

I'm having the same issue on a '10 ccsb 4.8l, I think it's the anti-siphon device in the filler neck that's causing my issue. I also replace the vent selonoid and still have the issue. Hopefully one of us can find a fix.

Anthony