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#4781991 - 06/09/18 08:20 AM Persistent, constant, high-pitched tone
FriboRage Offline


Registered: 09/06/12
Posts: 18
Loc: Pennsylvania
Iím just looking to pick some brains and see if someone more knowledgeable than me can provide some direction.

Iíve got this high pitched tone, itís like (beeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeep) but constant, thereís no start and stop. Itís almost like an audio whine if you have power wires too close with speaker wires. Sometimes it borders on a buzzing, but itís always closer to the beep. Itís unchanging and independent of engine speed or load.

At first I thought it was an audio issue, but itís most audible under the car and with all the doors and windows closed, though itís also very noticeable inside the car. I settled on a fuel pump since itís so loud under the car, changed the pump with a brand new oem ac delco pump. Still there... though at 14 years old and 150k it probably could use the pump anyway. Iím going to change the fuel filter today.

It happens at key on and goes for about 2-3 seconds, then stops forever until I start the car.. then itís constant. Thatís the main reason I went with fuel pump.

So now Iím trying to figure out whatís happening. I only had 1 DTC that I cleared and never came back... P1811, max adapt long shift. Can the noise be the tranny fluid pump?

I havenít had a chance to check the fluid level, Iím planning to change the fluid and filter today since itís been a few years.


Edited by FriboRage (06/09/18 08:24 AM)

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#4781997 - 06/09/18 08:25 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
AVB Offline


Registered: 05/20/12
Posts: 1391
Loc: Georgia
That is normal fuel pump noise.

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#4782000 - 06/09/18 08:28 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
FriboRage Offline


Registered: 09/06/12
Posts: 18
Loc: Pennsylvania
It canít be, itís ear-piercing... I know the pump whines at key-on and while running but thats more like a hum.

Even my girlfriend who knows nothing about cars was like, what is that horrible noise... after riding in this car for 10 years.

Unless the fuel filter is blocked up somehow and the pump is straining way harder than it should... in which case Iím changing that filter today so Iíll find out.


Edited by FriboRage (06/09/18 08:34 AM)

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#4782011 - 06/09/18 08:39 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
spasm3 Offline


Registered: 05/30/10
Posts: 8904
Loc: North Carolina
See if there is a fuse for the fuel pump, pull it and see if the sound goes away. If it does wink. If it goes away, i'd change the fuel filter first and see if there is any change, then the fuel pump.
_________________________
13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5000 miles m1 0w30

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#4782012 - 06/09/18 08:39 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
eljefino Offline


Registered: 06/15/03
Posts: 32907
Loc: ME
Whack the bottom of the tank with a 2x4 and try throwing some 2-stroke oil in.

It might be some other gadget related to the fuel system like a regulator or some EVAP thing.

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#4782014 - 06/09/18 08:44 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
AVB Offline


Registered: 05/20/12
Posts: 1391
Loc: Georgia
Try the filter, I always replace the filter when I install a new pump. I believe that is a requirement for the pump warranty.

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#4782024 - 06/09/18 08:55 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
Leo99 Offline


Registered: 03/30/14
Posts: 3167
Loc: NJ
Maybe pull some fuses and see if the sound stops.
_________________________
Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles

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#4782044 - 06/09/18 09:14 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
ragtoplvr Offline


Registered: 01/14/15
Posts: 578
Loc: missouri
1.. fuel filter. Most auto fuel pumps have brushes. the pumped gas flows over the pump motor to cool it and lube it. So 100% of the brush wear, copper and bearing wear end up in the filter. Always change it.

2. Check to see if some of the isolator rubber for the tank mounting and things around it have deteriorated. I suspect that some noise isolation rubber is gone somewhere.

Rod


Edited by ragtoplvr (06/09/18 09:20 AM)

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#4782269 - 06/09/18 01:57 PM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
JLTD Offline


Registered: 12/15/17
Posts: 937
Loc: US
Telling us what car you have might be really helpful.
_________________________
Hers: 2008 Jeep Liberty 138k, AMSOILģ SS 5w30/Amsoil

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#4782926 - 06/10/18 10:01 AM Re: Persistent, constant, high-pitched tone [Re: FriboRage]
FriboRage Offline


Registered: 09/06/12
Posts: 18
Loc: Pennsylvania
Sorry, itís a 2004 Grand Prix GTP. Iím used to posting on a forum where my car is in a signature.. I donít have that set up here.

Anyways, I did the fuel filter and itís 200% better. Not only is the noise gone, but itís dead silent... not even a quiet whine or hum. Better than before the problem started!

Thanks everyone for your input!

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