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06-22-2010, 11:31 AM
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#1 |
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Registered User
 Join Date: May 2010
Location: Salem, NJ
Posts: 48
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Humming noise
I have a 1999 silverado 1500 z71 with a 4.8. There is a humming noise coming from under the truck sounds like the fuel pump but just replaced it. Any Ideas?
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06-22-2010, 11:34 AM
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#2 |
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Registered User
Join Date: Feb 2009
Location: Oklahoma
Posts: 7,461
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Re: Humming noise
Did you change your fuel filter?
The one on my 03 will do that sometimes. Usually after I pull a load on a trailer. It will be loud for a day or two, and then go back to normal. |
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06-22-2010, 05:57 PM
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#3 |
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Registered User
Join Date: Jan 2003
Location: Denison, Texas
Posts: 1,919
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Re: Humming noise
Are you sure its not you hummin to the music?
 Just Kiddin Does the sound change at all like with speed, throttle, etc?
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1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F |
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06-23-2010, 07:06 AM
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#4 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: Humming noise
what brand of fuel pump did you use? i know on these truck alot of the after market pumps do not last as long as an oem gm pump and are noisy. my friend had one replaced 5 times in 6 months before the shop put in a gm pump and its been fine since
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 06-23-2010 at 07:07 AM. |
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06-23-2010, 09:03 AM
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#5 |
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Registered User
Join Date: May 2010
Location: Salem, NJ
Posts: 48
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Re: Humming noise
I used a napa fuel pump and yes i did chenge the fuel filter along with the fuel pressure regulator on the fuel rail lol. The humming always stays the same no matter what and is always there. Now that i think about it the humming really started after i put the fuel pressure regulator valve in. Any thoughts????
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06-23-2010, 09:05 AM
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#6 | |
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Registered User
Join Date: May 2010
Location: Salem, NJ
Posts: 48
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Re: Humming noise
Quote:
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06-23-2010, 11:33 AM
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#7 |
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Senior Member
Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,849
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Re: Humming noise
I just put a aftermarket fuel pump in my friends toyota and its louder than the origional. Ive always noticed aftermartket pumps are louder for some reason.
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1967custom |
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06-23-2010, 02:21 PM
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#8 |
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Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,236
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Re: Humming noise
thats because they run harder to produse the some amount of pressure as a factory pump thats why they dont last as long
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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