occasional hum from fuel pump
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well, it's tuneless.....
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s ALL SOLD
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32,794 Posts
I am tone deaf too.
Seriously. It may or may not be a sign that it is going. Might be prudent to start looking for a replacement. That way you can don't have to pay the price in an emergency.
Seriously. It may or may not be a sign that it is going. Might be prudent to start looking for a replacement. That way you can don't have to pay the price in an emergency.
1997 SL500- 40th Anniversary
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7,453 Posts
Old rule of thumb... If your pump(s) 'a humming, you'll soon be a thumbing!
Looks like another job for the winter.
How often should the fuel filter be changed?
How often should the fuel filter be changed?
'72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
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14,148 Posts
I am still running on the original fuel pump on our 72. At times it has hummed. But for at least a year, I haven't heard a squeak out of it. Don't know what causes it - may be some sort of harmonic vibration but don't know what initiates it.
BTW, I did buy a spare pump just in case, but see no need to replace it. I have had pump out once in 21 years and have cleaned it, but not much to clean.
Regarding filters, I recall every 30,000 miles being the recommended interval, but stand to be corrected!
mines been humming for last 2 1/2 yrs, in that time I've done 30,000 km's without a problem ( have a spare just in case)
I change my filter every year, probably a bit of overkill i know, but at least I know my injection system is always performing at optimum levels.
the lurker
I change my filter every year, probably a bit of overkill i know, but at least I know my injection system is always performing at optimum levels.
the lurker
1981 380SL 151K: 2005 S500 116K: 2006 E320 CDI
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39,468 Posts
That's what I thought, although mine may have been humming much longer prior to my ownership.
as much trouble as I've had with my fuel system, if I didn't hear the hum at "key on" my paranoia would be running rampant. it's an electric motor pumping fuel, I suspect that noise is alowed, What is a hum? how loud is too loud? I guess it takes a trained ear to hear "normal/abnormal". knowing your own car is priceless.........................
I've now bought a new pump and filter so its unlikely the noise will ever happen again!
89 Mercedes 300E, 91 Mercedes 300CE, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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18,680 Posts
Rule of thumb is change the fuel filter when you change the spark plugs.
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