5 pounds, if that. Make sure you remove the vent solenoid and leave the vent line open so the tank doesn't pop when the cars sitting in the sun. Route the purge line somewhere there is no chance of spark, don't cap it, you still want a way for the vapors to escape. Otherwise pressure will build and open the filler cap emergency relief. You're basically throwing gas away even if you don't care about the emissions.
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