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Engine "whistling" noise

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I was sledding around during lunch hour yesterday. I heard this noise in the engine compartment, It made the noise under every throttle position, backshifting and even braking. I heard this noise before on my old sled before the rope broke. Is this what is happening?
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Have you reached in the fuel tank to make sure there are no sharp bends in the fuel pick-up line? I have heard some complaints on this board that the fuel pump is "whining" due to starvation of fuel from the line being kinked or a Smart Valve being stuck in the closed position.... Keep us posted on this matter. Thanks.
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