4kq:odd electrical noise from fuel pump area

[A.M. "TEX" Terry, II]

Mike - did you replace the in-tank fuel filter also, or just the outside
fuel filter?  Sounds like your fuel pump is being blocked, then starving
the engine, then being unblocked.  A dirty in-tank filter will cause this.
The noise is probably the pulsation of the fuel pump strokes.  Have you
verified that you do not have loose pieces of rust scale debris in the
tank?  These pieces can get picked up and block the in-tank filter, then
drop back off the filter.  The rust scale will come from condensation on
the inside walls of the fuel tank.

Tex Terry, II
83 5kt sedan (non-quattro)
Franklin, PA  USA
>
> Message: 16
> Date: Tue, 27 Nov 2001 08:50:23 -0800 (PST)
> From: Mike Faulhaber <puppyscent at yahoo.com>
> Subject: 4kq: odd electrical noise from fuelpump area
> To: quattro at audifans.com
>
>
> 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.
>
> Thoughts?  btdt?
>
>
>
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