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Old 10-13-2011, 06:04 PM   #1
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ATV: 06/650 V2 & 06/800 Can-Am Max
2010 Mileage: 1000
2009 Mileage: 750
2008 Mileage: 500
2007 Mileage: 1,600
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650 V2 Fuel Pump Question

In what manner is the fuel pump on the 650 suppose to work?

Here's what is happening - comments please...

When the key is turned to the "on" position the fuel pump pumps for a few seconds then shuts off - at least that's the noise I believe I'm hearing.

If I open the carb drains, there is fuel in the float chambers and fuel drains from the float bowls. Even tho the fuel has been drained and the falling carb floats have opened the needle valve, no additional fuel is pumped into the carbs by the fuel pump. The fuel pump does not cycle again unless the ignition key is cycled.

If a fuel pump works with a pressure shut-off - such as most autos - the minute the carb drains are opened, the fuel pump should again begin pumping until fuel line pressure is sensed (by the rising float and closing of the needle valve) at which time the pump shuts off.

This does not happen on my 650 since draining the fuel from the float bowls does not reactivate the fuel pump.

I don't know if it's suppose to work like that, but if it is, how does fuel get from the tank to the carbs when running, or when the starter is engaged?

I certainly hope the fuel pump is suppose to operate the way it is currently doing because I'll have to sell my first born...the dealer wants $692.00 for a fuel pump (on-line $505.).

In any event how does fuel get to the carbs when the starter is activated or the machine is running? And what is the manner in which the fuel pump activates?

Help.
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Old 10-14-2011, 11:08 AM   #2
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mine works exactly the same, I believe the pump starts pumping again once the ignition is working (engine running)...
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Old 10-16-2011, 01:36 PM   #3
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If you do end up needing to replace the fuel pump, Check out the pump for a Yamaha Vstar 1100 motorcycle. They are around $110. Not entirely sure it would be the same, but I know the pump operates in the same manner you describe. And that bike uses the same carburetors as the V2 I believe.
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