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Originally Posted by diamondlarry
Many people have said that this can cause the charcoal canister to get saturated but I've never seen a problem with that.
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interesting - learn something new every day...
did some searching: overfilling the tank may put raw fuel into the tank vent line (on some cars the vent line connects to the top of the tank; on others it's at the top of the filler neck). if the vent system is filled with enough liquid fuel to saturate the charcoal canister effectively "blocking" the vent function, ODB2 cars will throw a code for Evaporative Emission Control System Malfunction.
neato. i've been filling my tank this way for 10,000 km on firefly#1 and firefly#2, and haven't seen any codes.
Matt Timion 
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