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Old 03-01-2001, 01:39 PM
MGL
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I have a 1988 300e when i open the fuel cap it sounds like a vacuum cleaner was just turned on my guess is a clogged vent tube if so where is it locoted and would this problem make the motor starve for fuel and run poorly
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Old 03-01-2001, 02:13 PM
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Have the same car

My 300E does the same thing. I think this is normal since the fuel system is under pressure. My Jeep Cherokee would also make a hissing sound when the gas cap was removed. I slowly turn the cap when opening to let the pressure release gradually.
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Old 03-01-2001, 02:21 PM
MGL
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thanks crowe but would this hane anything to do with performance thanks
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Old 03-01-2001, 06:56 PM
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Fuel supply pressure

The owner's manual says to "turn fuel filler cap to the left and hold on to it until possible pressure in tank has been released, then remove cap". Having pressure in the fuel system is normal, I can not see how it would do anything to impact the performance of your MBZ.
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Old 03-01-2001, 07:01 PM
MGL
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thanks again crowe for your responce
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