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FJR Motorcycle Forums
Technical & Mechanical Problems
FJRF011: Fast Starter Syndrome
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<blockquote data-quote="Constant Mesh" data-source="post: 823648" data-attributes="member: 615"><p>A possible/likely answer is a leaky check valve (back flow prevention) at the fuel pump. If the check valve allows the fuel rail pressure to drop over time the brief fuel pump operation at key 'on' may not be long enough to fully pressurize the fuel rail. If the fuel pressure is low the fuel may not atomize properly and/or may not be emitted in proper quantity at start-up. If this happens more of the fuel ends up coating the cylinder wall and flooding can occur.</p><p></p><p>It's been suggested before that one should cycle the fuel pump a few times before cranking the engine if the bike has been sitting unused for a long time. This ensures that the fuel rail is pressurized properly before cranking.</p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 823648, member: 615"] A possible/likely answer is a leaky check valve (back flow prevention) at the fuel pump. If the check valve allows the fuel rail pressure to drop over time the brief fuel pump operation at key 'on' may not be long enough to fully pressurize the fuel rail. If the fuel pressure is low the fuel may not atomize properly and/or may not be emitted in proper quantity at start-up. If this happens more of the fuel ends up coating the cylinder wall and flooding can occur. It's been suggested before that one should cycle the fuel pump a few times before cranking the engine if the bike has been sitting unused for a long time. This ensures that the fuel rail is pressurized properly before cranking. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
FJRF011: Fast Starter Syndrome
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