4kq:odd electrical noise from fuel pump area

[Huw Powell]

> 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

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/