High Pitch
Thread Starter
7th Gear
Joined: Oct 2005
Posts: 7
Likes: 1
High Pitch
After 59 years I finally got the car that I have always wanted, a 1997 with 32000 miles. I have read the forum every day for a couple of months now and learned more than I could have hoped to but now have a question that I have not seen posted.
I have a high pitch hum or tone coming from the back of the car. Turning the radio off does no good. A very uneducated guess on my part would be a fuel pump but, obviously, it is just a guess. Can anyone help me with this?
In advance, thanks for your help. This is a great bunch of Corvette owners from what I have see so far.
I have a high pitch hum or tone coming from the back of the car. Turning the radio off does no good. A very uneducated guess on my part would be a fuel pump but, obviously, it is just a guess. Can anyone help me with this?
In advance, thanks for your help. This is a great bunch of Corvette owners from what I have see so far.
Burning Brakes
Joined: Feb 2004
Posts: 911
Likes: 98
From: Orchard Park N.Y.
If it is coming from behind you on driver side then yes it is the fuel pump. After the car warms up it usually is not noticeable. I believe there is a way to insulate that area to cut down on the noise but I have not done it.
Le Mans Master
Joined: May 2003
Posts: 6,454
Likes: 3
From: Hells Sister City Phoenix AZ
St. Jude Donor '03
Too bad it's not from the front cause then I'd say it was the supercharger you didn't know you had.
From the rear I'd say fuel pump. If it stops when the car is stopped then I'm guess rear end or tranny. Just my .02!
From the rear I'd say fuel pump. If it stops when the car is stopped then I'm guess rear end or tranny. Just my .02!
Team Owner
Joined: Aug 2002
Posts: 35,617
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Tech Contributor
Cruise-In 11 Veteran
NCM Ambassador
St. Jude Donor '05-'06-'07-'10
As others have indicated I'd say you are spot on with your fuel pump guess. The '97's had a known issue with noisy fuel pumps. My '97 has had this since I got her four years ago. I've put about 30,000 miles on the car in this time. It is not symptomatic of a pending failure and for the most part is just an annoyance. I've heard it is about 700 dollars to repair. I don't know if this is true or not.
Paul
Paul
Race Director
Joined: Jul 2005
Posts: 11,308
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From: The Beautiful Greater Bay Area California
Originally Posted by talon90
As others have indicated I'd say you are spot on with your fuel pump guess. The '97's had a known issue with noisy fuel pumps. My '97 has had this since I got her four years ago. I've put about 30,000 miles on the car in this time. It is not symptomatic of a pending failure and for the most part is just an annoyance. I've heard it is about 700 dollars to repair. I don't know if this is true or not.
Paul
Paul
Yes, they are loud on the '97's. However, do a diagnostics manual check to be safe, and, to make sure you are not coding for a faulty fuel pump assembly unit.
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Le Mans Master
Joined: May 2003
Posts: 6,454
Likes: 3
From: Hells Sister City Phoenix AZ
St. Jude Donor '03
If it's really $700 to fix just spend that on a new exhaust and you'll enjoy it more than putting the $$ into a fuel pump fix. Buy Borlas and I'll bet you never hear the sound again. 
Race Director
Joined: Sep 2004
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From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Originally Posted by comtrans
Thank you very much for your information. (No, I didn't know I had a supercharger, by the way!!!)
Can I access the pump from the interior?
Can I access the pump from the interior?
Nope, it is in the tank
Advanced
Joined: Oct 2005
Posts: 78
Likes: 0
There are actually 2 fuel pumps, 1 in each tank. One pumps fuel from one tank to the other, the other one pumps it to the engine. If you look under the back of your car, you'll see the tanks on either side of the transmission. The pump assemblies are at the back of each tank at the bottom... looking right at you. One will have 2 hoses, the other has 3. As stated, the sound is a known issue addressed on later models. It is not supposed to be an indicator of eminent failure, as often is the case on many other GM vehicles.