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FJR Motorcycle Forums
Technical & Mechanical Problems
Dead FJR - no starter engage/spin
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<blockquote data-quote="mcatrophy" data-source="post: 1358553" data-attributes="member: 3187"><p>I have tried many tests on when the fuel pump runs <em>before the start button is pressed</em>. Below is what I have found:</p><p></p><p>If the kill switch is OFF (engine can run), and regardless of being in or out of gear, side-stand up or down, brake lever pulled or not (dunno about clutch lever, I've never had an FJR with one of those), the fuel pump runs for about 3 seconds, then it stops.</p><p></p><p>This is nothing to do with fuel pressure, it is timed from the key being turned (see <a href="https://atrophy.lock.net/do/fuel_gauge.php" target="_blank">here</a> for when I was using the pump to empty the tank).</p><p></p><p>While the kill switch is the ON position (engine can't run), the fuel pump won't run. But, if you switch the kill switch to OFF partway through that 3 seconds from the ignition switch being turned on, the fuel pump will run for the remainder of the 3 second period.</p><p></p><p>If you turn the kill switch OFF after that 3 second period, the pump will not run at all.</p><p></p><p>What it boils down to is that the pump will run within that 3 second period whenever the kill switch is OFF - you can even play stop/start of the pump by flicking the kill switch rapidly between the ON and OFF positions within those first three seconds. After the 3 seconds the pump won't run regardless of what you do with the kill switch.</p><p></p><p>This is true on my Gen 2 and Gen 3 bikes.</p></blockquote><p></p>
[QUOTE="mcatrophy, post: 1358553, member: 3187"] I have tried many tests on when the fuel pump runs [I]before the start button is pressed[/I]. Below is what I have found: If the kill switch is OFF (engine can run), and regardless of being in or out of gear, side-stand up or down, brake lever pulled or not (dunno about clutch lever, I've never had an FJR with one of those), the fuel pump runs for about 3 seconds, then it stops. This is nothing to do with fuel pressure, it is timed from the key being turned (see [URL="https://atrophy.lock.net/do/fuel_gauge.php"]here[/URL] for when I was using the pump to empty the tank). While the kill switch is the ON position (engine can't run), the fuel pump won't run. But, if you switch the kill switch to OFF partway through that 3 seconds from the ignition switch being turned on, the fuel pump will run for the remainder of the 3 second period. If you turn the kill switch OFF after that 3 second period, the pump will not run at all. What it boils down to is that the pump will run within that 3 second period whenever the kill switch is OFF - you can even play stop/start of the pump by flicking the kill switch rapidly between the ON and OFF positions within those first three seconds. After the 3 seconds the pump won't run regardless of what you do with the kill switch. This is true on my Gen 2 and Gen 3 bikes. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Dead FJR - no starter engage/spin
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