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#1
02-16-2006, 05:52 PM
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Fuel pump
Leaving for a trip tomorrow. I'll be going over the car ('99 C280) tonight to make sure everything is snug and dry. Just curious, do failing fuel pumps usually give a warning by getting noisy before they totally give up or do they fail silently sometimes? Mine isn't noisy but I don't know if that really means anything other than it just isn't noisy.
Thanks, Dan
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2012 E350 Bluetech 
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#2
02-16-2006, 06:35 PM
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Do you suspect it? If so why?
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-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/831799-post13.html http://www.peachparts.com/shopforum/831807-post14.html
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#3
02-16-2006, 06:45 PM
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I agree. Why that particular component as opposed to something else (like a tire failure or a dead battery)?
Anyway, the fuel pump failed on my ML on a holiday weekend miles away from any reputable dealer. I will add that for six months, between the hard starts, stalls and occasional CE light, I chose to ignore ALL of the warnings and pressed on anyway. That was an $1100 mistake! FWIW, fuel pumps generally don't fail abruptly...unless it's under a stress condition...like racing. I've had pumps fail on different cars, and all of them gave months of warnings before they "gave up the ghost"...
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#5
02-17-2006, 10:00 AM
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Quote:
Try not to worry about the laws of entropy for now...it will drive you nuts! 
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#7
02-19-2006, 02:12 AM
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If I've decided the electric fuel pump is bad after veryfying that voltage is getting to it and the elect connections are tight i'll do one last test before replacing it. I hit it lightly with a hammer or pipe. That usually gets it going again for a while (like a starter or alternator on the fritz). It's a real crowd pleaser when you get a car running with a hammer!
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1972 450SL 1982 300D Turbo
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#8
02-19-2006, 10:43 AM
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I'd suggest a little preventitive care to possibly extend the life of the pump. Change your fuel filter to avoid an additional load on the pump as well as avoiding a common cause of fuel starvation - a clogged filter.
Tim
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