What would cause my 2002 Harley-Davidson Ultra Classic to start sputtering and throttle body backfiring after using 1/2 of a full tank of fuel? I refuel to full and it runs fine.
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Don’t know if this is true for HD, there has to be a vent in the top of the fuel tank to let air in as the fuel level goes down. If this vent gets blocked, the area above the fuel forms a partial vacuum. This restricts the fuel supply to the engine.
Test , when you experience this problem, open and close the fuel cap and if there is a blockage, the engine will run normally.
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Wasn't the case in my situation but thanks for the idea.
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Ruling out water contamination (water settles and heavier than gasoline), is it possible for restriction in the fuel line and/or shutoff valve (if they're still used)? Ethanol blends attract moisture and can cause premature corrosion in fuel lines and metals. Fuel may also corrode carburetor parts.
F Dryer 의