Fuel pump makes a loud humming - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 08-10-2009, 09:27 AM Thread Starter
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Post Fuel pump makes a loud humming

My 1990 300 SE is running great. However, the fuel pump makes a loud humming noise while the engine is running. It is actual annoying, specially if you sit in the back seat.

Is this normal? or just a sign that the pump is about to quit on me?
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post #2 of 3 (permalink) Old 08-10-2009, 10:29 AM
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Originally Posted by samhs View Post
My 1990 300 SE is running great. However, the fuel pump makes a loud humming noise while the engine is running. It is actual annoying, specially if you sit in the back seat.

Is this normal? or just a sign that the pump is about to quit on me?
Yes, and yes. The pumps are normally pretty loud, but if it's gotten noticably louder in past few days/weeks, it may well be on its way out.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #3 of 3 (permalink) Old 08-10-2009, 11:40 AM
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Some have been able to save their pumps by removing them and running diesel fuel through them backwards to clean them out.

Len
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