Buzzing sound...fuel pump? (video)
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From: PNW
Buzzing sound...fuel pump? (video)
Hey all!
Backstory: I was on a drive from WA to CA. At a gas station, I "high centered" the car on a VERY uneven metal cover for one of the gas station's underground tanks. I hit the bottom of the car pretty good. Immediately afterward, I started to get a groan/buzz from the fuel pump area. I also noticed some hesitation on the remainder of my 1200 mile drive. Once in CA, I bought a cheapo "O'Reilly Auto Parts" house-brand fuel pump and threw it in. It helped, but the noise still comes and goes. Even more odd is that the noise often changes pitch when I press the brake pedal, making it seem voltage related?
Video:
Car: '03 C5Z, H/C/I LS3, Racetronix fuel pump relay harness (~500whp)
Any help/info is appreciated! If it turns out to be the pump, I'm looking for the lowest cost high quality drop-in replacement...don't need to support more than 700whp (leaving me room for a blower in the future). What are my best options? It's an early '03, single pump on the driver side. Thanks again!
Backstory: I was on a drive from WA to CA. At a gas station, I "high centered" the car on a VERY uneven metal cover for one of the gas station's underground tanks. I hit the bottom of the car pretty good. Immediately afterward, I started to get a groan/buzz from the fuel pump area. I also noticed some hesitation on the remainder of my 1200 mile drive. Once in CA, I bought a cheapo "O'Reilly Auto Parts" house-brand fuel pump and threw it in. It helped, but the noise still comes and goes. Even more odd is that the noise often changes pitch when I press the brake pedal, making it seem voltage related?
Video:
Car: '03 C5Z, H/C/I LS3, Racetronix fuel pump relay harness (~500whp)
Any help/info is appreciated! If it turns out to be the pump, I'm looking for the lowest cost high quality drop-in replacement...don't need to support more than 700whp (leaving me room for a blower in the future). What are my best options? It's an early '03, single pump on the driver side. Thanks again!
Last edited by PNW_C5Z; Sep 30, 2020 at 02:11 PM.
Thread Starter
Instructor
Joined: Jan 2020
Posts: 111
Likes: 8
From: PNW
I'll check, but there aren't any other signs of a vac leak...and it sounds to be pretty clearly coming from under the rear of the car. You can hear it standing next to the car, too.
Thread Starter
Instructor
Joined: Jan 2020
Posts: 111
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From: PNW
I'll check that too. I did think a bit on the vac leak suggestion and that might hold water after all. I'll check that out, too.
Thread Starter
Instructor
Joined: Jan 2020
Posts: 111
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From: PNW
Just an update for future search purposes...
The loud whining noise was actually coming from the *fuel filter/FPR*, and not the fuel pump!!! I'm not sure how or why, but I was under the car while my wife primed the system several times. Zero noise from the pump; but the filter assembly made the loud whine, and you could actually see the back end of the filter swell/expand outward nearly 1mm when the noise was present. I'm guessing it was some sort of clog. Replaced the pump AND the filter/FPR just for good measure, and no more noises.
The loud whining noise was actually coming from the *fuel filter/FPR*, and not the fuel pump!!! I'm not sure how or why, but I was under the car while my wife primed the system several times. Zero noise from the pump; but the filter assembly made the loud whine, and you could actually see the back end of the filter swell/expand outward nearly 1mm when the noise was present. I'm guessing it was some sort of clog. Replaced the pump AND the filter/FPR just for good measure, and no more noises.
