RE: [DML] Fuel Pump Noise

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Dick,
I to have done a lot of research in various ways, talking to Bosch about
pumps and Airtex about filter screens. Plus I listen and compare notes on
the chat I hear. I think it's several things.

1st, I have a new input filter screen on the pump that would eliminate any
input of fuel problems and stress of the pump to deliver the fuel. The white
filters tend to stop up faster because they are filtering at about 30 Micron
and cause the pump to stress and make noise. My new filter doesn't filter
that tight because the pump can pass larger micron particles and I'm not
using any more epoxy to attach the aluminum post.
  http://www.specialtauto.com/delorean-parts/images/fuel-filter-screens.jpg

#2. Then with the permission of Dave Bauerle I have had the Hot Air Dam that
goes behind the radiator fans rebuilt and water jet cut to cut down on the
heat from the fans heating up the fuel even more.
http://www.specialtauto.com/delorean-parts/cooling-fans.html

#3. Then, since our pumps are immersed in fuel and are self priming, I feel
the lower the fuel is the more it has to work to prime. Fuel like water
seeks it's level and the more in the tank the less it has to self prime.

#4. The other consideration is Voltage. Normally any electric motor that
doesn't have it's design supply of voltage and current will make more noise
and draw more current. I compare this to a ceiling fans that is operated by
a resistive dimmer switch. As the voltage goes down to adjust the fan speed
the hummm's goes up.

So, In summing up, I feel there is a combination of things that contribute
to pump noise and I have addressed as many as I can with product. The rest
is up to us, in making sure we have the voltage and current the fuel pump
motor needs, and the pump is immersed as best we can in fuel.

John Hervey
www.specialtauto.com
The search goes on.





-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx]On Behalf
Of Dick Ryan
Sent: Friday, April 22, 2005 10:05 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Fuel Pump Noise




Guys

As a D owner since 1982 and active on the list since
its inception, you might think I'd have all the
answers.  Not even close.  One problem that has
irritated me off and on since I first owned a D is
that damn fuel pump noise.





To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/