[s-cars] Fw: Strange Fuel Pump Behaviour

[Jerry Scott]

 Brian
 In high heat, I have had the gas tank vent to atmosphere, which makes a 
humming sound.  This is the alcohol in the gas vaporizing due to the high
 temperature of the fuel.  Just an idea, but I will bet that was your 
problem.  Pulling the battery cable will have no effect on the sound.
 Jerry



----- Original Message ----- 
> From: "Brian Armstead" <barmstea at bbg.gov>
> To: <s-car-list at audifans.com>
> Sent: Monday, June 09, 2008 6:18 AM
> Subject: [s-cars] Strange Fuel Pump Behaviour
>
>
>>
>> All,
>>
>> Took my '93 S4 out yesterday in 100 degree heat for a cruise.  Car
>> battery had died so the night before I charged it up.  After getting to
>> my destination, I noticed a slight hum/whine from the trunk when I shut
>> it down (lasted about 5 seconds).
>>
>> When I got home after pushing the car hard, the hum/whine would not go
>> away after I shut the car off.  Opened the trunk, put my hand on the top
>> of the fuel pump access plate, and could feel slight vibrations.  Pulled
>> fuse number 17, no change.
>>
>> Here's where it gets a bit weird.  Pulled the negative battery cable (I
>> smelled gas fumes and this thing was still whirring) and the STILL
>> felt/heard pump noise.  Finally died out after a couple of minutes.
>>
>> 3/4 full gas tank, 134K miles, no previous trouble.
>>
>> Help!!
>>
>> Brian
>>
>>
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>