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I put anywhere from 3 - 4 gallons in after the shut off and never had a CEL as a result. I have the 46 gal tank - no mods.
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Pat, has your pump been harpooned? Before I did that mod to the fuel pump, it took 10 gallons to fill my tank from the 1st shutoff. After the harpooning it takes 4-5 gallons to fill from the 1st shutoff. So, I'm guessing it would take more than 5-6 gallons to cause my CEL.
It looks like I should just completely fill the tank and find out what the code is.