fuel pump replaced
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
fuel pump replaced
I replaced my noisy fuel racetronix fuel pump with a LPE pump and the noise is STILL THERE 
I had installed an aftermarket pump about 1 1/2 years (4000 miles) ago. Then approx. 1 1/2 months ago, right before a "road trip" it starting getting much louder (Sounded like fuel being sprayed under pressure, almost a "hissing" sound) Well I feared the worst, and after getting some second and third opinions here, and on LS1tech, I decided to replace the pump. Well I got it installed today, and....the noise is the same. I had already replaced my fuel filter,and I checked the fuel pressure at idle, and it's 60+ (gauge only reads 60psi)
So I guess I'll just drive it and if it fails, Oh Well
I had installed an aftermarket pump about 1 1/2 years (4000 miles) ago. Then approx. 1 1/2 months ago, right before a "road trip" it starting getting much louder (Sounded like fuel being sprayed under pressure, almost a "hissing" sound) Well I feared the worst, and after getting some second and third opinions here, and on LS1tech, I decided to replace the pump. Well I got it installed today, and....the noise is the same. I had already replaced my fuel filter,and I checked the fuel pressure at idle, and it's 60+ (gauge only reads 60psi)
So I guess I'll just drive it and if it fails, Oh Well
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
Likes: 31
From: A dealer near you.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Not necessarily trying to dis the pump, just letting guys know that changing the pump out, in my case, did not eliminate the noise. I'm not sure if the old one was NOT bad, or the new one is. I wouldn't have thought much of it if it wasn't for the fact that the pump was very quite for several months (and miles) then all of a sudden it started making a louder noise. This pump is every bit as loud, and is actually very annoying
I have the racetronixs harness hooked up (directly to the alternator) and it makes me wonder if it is basically "overworking" the pump, by running it aster than is necessary for everyday driving.
I have the racetronixs harness hooked up (directly to the alternator) and it makes me wonder if it is basically "overworking" the pump, by running it aster than is necessary for everyday driving.
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
Not necessarily trying to dis the pump, just letting guys know that changing the pump out, in my case, did not eliminate the noise. I'm not sure if the old one was NOT bad, or the new one is. I wouldn't have thought much of it if it wasn't for the fact that the pump was very quite for several months (and miles) then all of a sudden it started making a louder noise. This pump is every bit as loud, and is actually very annoying
I have the racetronixs harness hooked up (directly to the alternator) and it makes me wonder if it is basically "overworking" the pump, by running it aster than is necessary for everyday driving.
I have the racetronixs harness hooked up (directly to the alternator) and it makes me wonder if it is basically "overworking" the pump, by running it aster than is necessary for everyday driving.
Live with it, turn the stereo up....or something. Factory pumps are know to whine for no reason as well.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Take a step back, and think about what you are saying here. The pump is designed to work within the output of a 12 volt system. The only difference in a direct wire hookup, is that you won't see the drop in voltage to the pump like you would if it were sharing the line side with other circuits. Provided the voltage regulator is functioning properly, the alternator is only capable of putting out so much voltage....it is not an endless source.
Live with it, turn the stereo up....or something. Factory pumps are know to whine for no reason as well.
Live with it, turn the stereo up....or something. Factory pumps are know to whine for no reason as well.
If the noise doesn't indicate the pump is "going bad" I don't have a problem living with it. When I posted the question here and on LS1tech, the consensus was that the the noise indicated the pump was going bad. If that wasn't the case, I SURE could have used that money for a performance mod instead
(Like getting my FAST ported)
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
I see as much as 13.5+ when the battery is slightly drained, and the LPE instructions stated one pressure for 12 volts and higher psi for more voltage, so I just wondered
If the noise doesn't indicate the pump is "going bad" I don't have a problem living with it. When I posted the question here and on LS1tech, the consensus was that the the noise indicated the pump was going bad. If that wasn't the case, I SURE could have used that money for a performance mod instead (Like getting my FAST ported)
If the noise doesn't indicate the pump is "going bad" I don't have a problem living with it. When I posted the question here and on LS1tech, the consensus was that the the noise indicated the pump was going bad. If that wasn't the case, I SURE could have used that money for a performance mod instead
(Like getting my FAST ported)
Pro
Joined: May 2008
Posts: 596
Likes: 2
From: Houston Texas
I don't even hear my pump at all............ 
If the noise is there than maybe it's related to the fuel return line...I had this happened on my Jeep and it was throwing me in the loop for a while.
BTW,don't know what's the fuel pressure should be on c5 ,but 60+ sounds high......
If the noise is there than maybe it's related to the fuel return line...I had this happened on my Jeep and it was throwing me in the loop for a while.
BTW,don't know what's the fuel pressure should be on c5 ,but 60+ sounds high......
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I don't even hear my pump at all............
If the noise is there than maybe it's related to the fuel return line...I had this happened on my Jeep and it was throwing me in the loop for a while.
BTW,don't know what's the fuel pressure should be on c5 ,but 60+ sounds high......
If the noise is there than maybe it's related to the fuel return line...I had this happened on my Jeep and it was throwing me in the loop for a while.
BTW,don't know what's the fuel pressure should be on c5 ,but 60+ sounds high......
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
how would a relay make the voltage constant at 12 volts, when the vehicle electrical system is not capable of staying constant at 12 volts?