dun na na na hamma time
noisy fuel pump
Thread Starter
Pro
Joined: Jan 2007
Posts: 666
Likes: 0
From: somewhere on tour as jake blues ohio
noisy fuel pump
every time i put a full tank of gas in my c5 the fuel pump makes a high pitch noise it only does it when i first start it up in the morning,anyone ever have this problem,and if you did was it a easy replacement or a pain in the *** like most gm vehichles
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
This is a puzzle. The early years C5s had a noisey fuel pump, but I think that was fixed in 1999 or 2000. My 1998 has a noisy fuel pump, it is worse when it is cold (early morning startup) and goes away when it warms up (or is warm outside).
BUT, yours is a 2003 C5, should not be noisy. Early year's pumps were just noisy, the noise did not mean that they were bad, but I would worry about yours ? It might be going bad. You could check fuel pressure, especially when it is making noise.
BTW, you have two fuel pumps and tanks. Usually the one behind the driver is bad/noisy. Replacing these can be a chore, you must drop exhaust pipes and go in through bottom.
BUT, yours is a 2003 C5, should not be noisy. Early year's pumps were just noisy, the noise did not mean that they were bad, but I would worry about yours ? It might be going bad. You could check fuel pressure, especially when it is making noise.
BTW, you have two fuel pumps and tanks. Usually the one behind the driver is bad/noisy. Replacing these can be a chore, you must drop exhaust pipes and go in through bottom.
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It's a PITA to replace. 
Intermediate
Joined: Oct 2006
Posts: 47
Likes: 0
From: Enon Ohio
I have a 97 drivers side that whines all the time. I purchased a new back-up pump and sender unit and will drive it until it fails. I have been told the same thing that the pumps are noisy. Once I get going my Borla Quads drown the noise out.
Last edited by whiplash 1; Feb 17, 2007 at 08:08 PM.
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Le Mans Master
Joined: Oct 2005
Posts: 6,503
Likes: 2
From: Oklahoma City OK
I have an 01 and mine is staerting to whine... GMPP will be happy to take care of this one.
BTW my 2000 silverado did this too and I sold it with 120k on the clock and it never died...
BTW my 2000 silverado did this too and I sold it with 120k on the clock and it never died...
