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Loud Fuel Pump Question


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10 replies to this topic

#1 84SOOB

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Posted 25 March 2004 - 04:19 PM

On my '84 BRAT the fuel pump has started to sound like a helicopter thump thumping behind me. You can only hear it when you are stopped at a traffic light or something, but it's getting on my nerves. Is it a sign that it's on its way out or do they all sound like that after a while? Thanks, Brian.

#2 jimkup

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Posted 25 March 2004 - 06:58 PM

My '88 Wagon's F.P. hums pretty loud. Has been happening prolly for at least a year or two. When the turn signal is on or I tap the brakes (while stopped) the tone changes slightly too. Hasn't given me a prob yet though. Not saying this is the norm, but, if it aint' broke....

#3 oddcomp

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Posted 25 March 2004 - 08:02 PM

check the mounts for it they usually are suspended on rubber bushings that can wear out and allow metal to metal contact
i am assuming the brat is carbed?

then the fuel pump will make a soft flutter/thump like noise due to its design but the bushing usually muffle the noise unless they wear out

if its fuel injected then it will be a constant whine sometimes easy to hear otehr times not depends on the pump design

but i would check the mounts first then look into a new pump
you could add a fuel pressure gauge inline so you know if its working at the right pressure

#4 gbianchi

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Posted 25 March 2004 - 08:39 PM

"On my '84 BRAT the fuel pump has started to sound like a helicopter thump thumping behind me. You can only hear it when you are stopped at a traffic light ". Thats exactly what mine does also been doing it for 2 years, the Brats name is therefor Huey:clap:

#5 TheSubaruJunkie

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Posted 25 March 2004 - 11:24 PM

Its a safety feature to let you know the pump is still working, you should only worry when you DONT hear it :) heheh

-Brian

#6 84SOOB

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Posted 26 March 2004 - 04:29 AM

I'll take a look at the bushings I guess--Thanks guys

#7 DaveAP

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Posted 26 March 2004 - 06:48 AM

my '84 brat does the same thing

#8 edalexandr

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Posted 26 March 2004 - 09:52 PM

mine is quiet as a mouse:confused:

#9 GeneralDisorder

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Posted 26 March 2004 - 11:08 PM

My 85 does that too. I know exactly what you mean. The reason only Brat owners can hear them is the location of our pumps is right behind the driver door - under the car. My guess is that a lot of the older pumps make this noise.

Ed - yours is under the hood - different pump too.

GD

#10 edalexandr

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Posted 26 March 2004 - 11:19 PM

yeah on the right side

#11 vwbuge

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Posted 27 March 2004 - 12:05 AM

My dad's '86 has been doing it for 3 years now.




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