Please turn off the engine when refueling, we like to see your posts here and don't want to be notified of a RIP (you or your car).
Taking off the gas cap with the engine running messes with the EVAP system in the car, it can also draw raw fuel directly into the charcoal cannister. It will also mess up your vacuum system, making the injectors stay open longer and fouling the spark plugs.
Also, when the gas pump nozzle shuts off, don't add more fuel for good measure. That just fills the filler tube with gasoline, forcing the excess to the charcoal cannister and wreaks havoc on the HVAC system.
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My back feels better when I sit in a Volvo seat
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