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Old 06-02-2013, 04:21 PM   #1
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Rear Humming Noise

Hi all, when I start my 2002 Bounder, there is a rear buzzing/humming noise near the rear tires. Sounds like its coming from the jacks. The jacks work fine. Raised and lowered the jacks to see if it went away, but no such luck. Maybe it's something else? Anybody encountered this? And it's not a hamster running on a wheel. Lol

Note, the noise is on when the engine is off and the ignition is on as well.

Thanks
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Old 06-02-2013, 04:37 PM   #2
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Maybe the inverter fan?

I say that as my inverter is right behind the left rear wheels but we don't have the same coach so I'm not sure where your inverter is located.

-harry
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Old 06-02-2013, 04:37 PM   #3
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There is another discussion recently about the fuel pump on a Bounder making a noise. Do you suppose it's the fuel pump? Is your Bounder a gasser or diesel?
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Old 06-02-2013, 06:22 PM   #4
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The Bounder is gas. Where's the fuel pump located?
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Old 06-02-2013, 06:28 PM   #5
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Most all fuel pumps on gas rigs are located inside the fuel tank and they do make a sort of buzzing sound when the key is turned on.

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Old 06-02-2013, 06:30 PM   #6
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There's a thread on this. Depending on fuel level my tank seems to amplify the humming sound of the in-tank fuel pump.
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Old 06-20-2013, 09:55 AM   #7
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My 1988 Bounder has an electric fuel pump mounted in the small compartment where the fuel filters are above the rear wheels on the right side. It's noisy when the MH starts up. The pressures good, the 7.4L runs good so I've ignored it for months now.
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Old 06-20-2013, 01:25 PM   #8
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Many large rigs have a vacuum pump that comes on when the key is turned on. It creates a vacuum in a reservoir and then shuts off in some rigs or runs continuously in others. Runs the dash comfort controls and perhaps the cruise control. Can be mounted anywhere on the frame.

Maybe that's what you're hearing.
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