The fuel pump on my 1987 300SL buzzes constantly. I'd rather not buy a new one if there's something I can do. Can these pumps be stripped and repaired/cleaned to overcome this problem?

Thanks.

Once the fuel pump is noisy it stays noisy, unless it's noisy because the filter is "stopped up" restricting the fuel flow. Since your car is 12 years old probaly the best thing to do is replace both pump & filter.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH

Once they get noisy, you're ridding on borrowed time. Get it replaced soon!

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Benzmac and M.B.Doc, I know this is old but searching your old notes helps me. Could this fuel pump noise make a strong hissing sound like an air hose on an air compressor? I've got that sound under my 1989 300E.

[This message has been edited by rlumsd (edited 10-28-1999).]

Yes, that is the noise! New ones sometimes are a little noisy too, but they don't growl. The ones that are on their way out do growl.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

I am a little confused, I have a hissing sound from the rear of the car which is a 1986 420 SEL and I am 99.9% sure it is the fuel pump. I have been told the hissing sound is normal, is that true ?

John r, check out the discussions in the folder "Benzmac, since Your the Man, settle this".

Those discussions have some great info that could help answer your question here.