Will fuel reset if you putting gas in while running on 96 e350?

Yes, if you add fuel to a 1996 E350 while the engine is running, the fuel system will typically recognize the new fuel, and it can adjust accordingly. However, it's generally not recommended to refuel with the engine running due to safety concerns, such as the risk of fire or spillage. It's best to turn off the engine before refueling to ensure a safe and proper refueling process.