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Can excessive white smoke be caused by fuel tank water condensation eg not using vehicle for 12 months?

Yes, excessive white smoke can be caused by fuel tank water condensation. When a vehicle is not used for an extended period, moisture from the air can condense inside the fuel tank. This water can then mix with the fuel and cause the engine to produce white smoke. Additionally, the water can corrode the fuel system, leading to further problems down the road.

To prevent this from happening, it is important to keep your vehicle's fuel tank full when it is not in use. This will help to displace the air inside the tank and prevent moisture from condensing. You can also add a fuel stabilizer to the tank, which will help to prevent the fuel from breaking down.

If you do notice excessive white smoke coming from your exhaust pipe, it is important to have your vehicle inspected by a qualified mechanic. They will be able to diagnose the problem and make the necessary repairs.