humming noise from rear when letting go of gas 2000 clk430

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Mar 23, 2011 | 01:25 PM

benzo_clk430

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2000 clk430 amg

humming noise from rear when letting go of gas 2000 clk430

hi there so i dirve a 2000 clk430 and when i am driving at any speeds and i let go of the gas i hear a humming noise from the rear of my car. when i push on the gas it goes away. what could casue this and what should i check for thanks..

Mar 24, 2011 | 01:16 AM

MarcusF

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From: SCV SoCal

2002 CLK430

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The fuel pump has an insulator. When the insulator goes bad (due to elements) the pump can get louder in certain circumstances. I'd look at the insulator.

Mar 24, 2011 | 04:15 PM

benzo_clk430

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2000 clk430 amg

Quote:

Originally Posted by MarcusF

Internet WAG:

The fuel pump has an insulator. When the insulator goes bad (due to elements) the pump can get louder in certain circumstances. I'd look at the insulator.

whats an easy way of getting to it as i am sure my fuel pump is in my tank.

Mar 24, 2011 | 04:21 PM

benzo_clk430

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2000 clk430 amg

what also gets me is if i just the cruise control the noise goes away could that still be caused by the diff or tranny?

Mar 25, 2011 | 01:02 AM

MarcusF

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From: SCV SoCal

2002 CLK430

Quote:

Originally Posted by benzo_clk430

whats an easy way of getting to it as i am sure my fuel pump is in my tank.

The pump isn't in the tank. It's next to the filter and talkes about 10 minutes to unbolt and check (I work slow, so some may say 5 minutes). Photo #1 shows a socket screwdriver being used to remove the plastic cover. Photo #2 shows the filter and pump after the plastic cover has been removed. Note the blue insulator. If yours is ripped up / deteriorated / trashed, that could cause the pump to make noise. So could the clamp if it's not tight.

As long as you're down there, you may want to check the flex discs. Photo #3 shows the rear flex disc (to the left of the fuel filter and pump / above the exhaust). There is a rear disc and a front disc. When they wear out, they can make noise. Those are about $100 per disc.

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