4kq:odd electrical noise from fuel pump area
A.M. "TEX" Terry, II
texactii at csonline.net
Wed Nov 28 10:16:59 EST 2001
Huw - Thanks for the pointer about the in-tank filter. I was not 100%
positive about this (and I did not have the manual with me) when I posted
the suggestion to Mike.
Tex Terry, II
83 5kt sedan (non-quattro)
Franklin, PA USA
> From: Huw Powell <audi at mediaone.net>
> To: texactii at csonline.net
> Cc: quattro at audifans.com; puppyscent at yahoo.com
> Subject: Re: 4kq:odd electrical noise from fuel pump area
> Date: Wednesday, November 28, 2001 12:30 AM
> > Mike - did you replace the in-tank fuel filter also
> there is no in tank filter on a 4kq, just a little pre-filter and the
> main can, both under the car in the slush...
> > > My '85 4kq has a (very) intermittent noise coming from
> > > around the fuel pump area that sounds like scratchy
> > > bursts of electrical static, sort of like something
> > > you'd hear on a shortwave radio -- or maybe a welder.
> > >
> > > This noise is loud enough to be heard from inside the
> > > cabin, and the pulsating can be felt on the lines
> > > going into the fuel pump, but not the pump itself.
> > >
> > > I replaced the fuel pump (and fuel filter, while I was
> > > at it), thinking that it was failing, but it's still
> > > there.
> > >
> > > Driveability suffers slightly when the noise is
> > > occuring.
> I would examine the wiring to the fuel pump. The ground wire attaches
> to the cars body under the back seat, and the positive wire has a single
> pin connector in a similar place. Look for nasty looking connections
> anywhere you can, what you have sounds like the nasty zappy sound of a 5
> to 10 amp circuit making and breaking intermittently. The performance
> suffers because the fule pump keeps turning off for moments at a time.
> At least, that's what I think might be happening...
> Huw Powell
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