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2004 Chevrolet Suburban - Slow gas fill

Problem filling fuel tank. Back air flow issue thru fill neck vent pipe. Very slow to fill. What could be the problem?

Clogged vent.

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Been there, suffered that, fixed it by replacing the charcoal canister and the purge valve while I was under there. Fixed it right up. About $125 in parts. Took me 30 minutes, maybe.

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Just filled on slow, no cost for 12 years.