RE: what should a fuel pump sound like?

["Chris DeLong" <green536@hotmail.com>]

>So the 8v pre-pump (external) should make some kind of buzz/humm
>noise then.

just to clarify here the prepump is in the tank thats why they call it a 
PREpump. It feeds fuel to the main pump. The external pump should make some 
noise. It is very difficult to hear noise from the prepump. try 
disconnecting the out line from the top of the tank (it has a little arrow 
pointing towards the front of the car and the hose is blue). Then attach 
another hose to the outlet nipple and have someone crank the engine. If fuel 
comes out then the prepump is working.


Okay, mine make NO noise..
>I will look into getting a new one and replace it see if it solves
>my cold start problem (though I am pretty sure it is related to the
>adjustment of the enrichment (co2) and a combination of 15 year old
>fuel injectors (noep never got replaced) and possibly my pressure
>control unit on the block (the car stalls on idle when cold but
>only if temperature is above 15'c/65'F) if colder starts on second
>turn of key and holds idle just fine, on Hot days (+ 70'F) it take
>me holding the gas pedal down to hold idle until the o2 sensor
>kicks in.

Sounds like maybe your fuel pressure regulator is bad. How does it run after 
it warms up?

>
>I think I shall change the pre-pump, the prep ump gas line valve,
>get the co2 adjusted, the injection bowl adjusted (I know it is off
>specs) and change the injectors and see what else could be in need,
>My in tank pump is probably not at fault (will get it checked) and
>My tanks has been cleansed about 2 months ago (emptied, and
>pressure cleaned/tested), though the filter was not changed on the
>pump. (perhaps need to change that too)

What filter?


>
>So much to do... so much time to achieve it...heheh
>
>Patrick
>
> > -----Original Message-----
> > From: owner-scirocco-l@scirocco.org
> > [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Dave Ewing
> > Sent: Sunday, October 07, 2001 1:21 PM
> > To: Scirocco List
> > Subject: Re: what should a fuel pump sound like?
> >
> >
> > Should be a nice even hum like a bee.  If it varies very
> > much at all (the
> > sound) and/or you can hear it over your motor then you
> > have problems.  When
> > I get into a car and start it, no matter what it is, and
> > I can hear the pump
> > from the driver's seat with the motor running then I
> > will generally
> > reccomend replacing the pump.  You only have one pump I
> > believe but if you
> > have two (pre and main) then you will have to figure out
> > which one is making
> > noise.  And if the pre pump isn't making noise then it
> > needs to be replaced
> > (easy way to check is to disconnect power supply to the
> > pump after removing
> > the cover under the back seat and seeing if there is a
> > difference in
> > sound--if the sound stops when disconnected then it is
> > working).   Most of
> > this is a combination of commen sense and experience.
> > Don't be afraid since
> > there isn't a whole lot you can do to the pumps just by
> > connecting/disconnecting and listenning for noises/or
> > quietness.  My moto--
> > Man made it, I can fix it!! (just say that over and over
> > to yourself!!)
> > HTH!!
> >
> > Dave
> >
> > > My 85 8v has been running a little rough when cold
> > lately.  I noticed that
> > > when i switch it to AC (pump is disconected) the
> > radiator fan kicks on ,
> > but
> > > the engine rpm stays the same.  So, i concluded that
> > the aux. air
> > regulator
> > > must not be working quite right.
> > > However, i stepped out of my car, and walked around to
> > the fuel pump side
> > > while it was running cold last night.  From about 10'
> > away i could hear
> > the
> > > fuel pump whizzing away.  It didn't sound destructive,
> > but like a cat
> > > hissing.  I have never noticed this before.  Last time
> > i had a fuel pump
> > go
> > > bad, the car would stall after freeway use, but my car
> > runs great when it
> > has
> > > warmed up.
> > >
> > > Could it be going?  I am thinking i ought to replace
> > it anyway, like a
> > timing
> > > belt, but the $200 price tag is a bit more to consider
> > than a $10 timing
> > belt!
> > > Any ideas or other warning signs i should look out for?
> > > thanks
> > > Ben
> > > 85 8v
> > > 84 8v in hiding
> > >
> > > --
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> > >
> >
> >
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> >
>
>
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