Re: [DML] Fuel Pump Noise

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Sounds like a good theory. If part of the issue is that the the top part of 
the tank from which the fuel pump dangles essentially becomes a sounding 
board that amplifies the noise of the pump when the damping effect of the 
gasoline is removed, then you could stiffen the top of the tank by bonding 
sound deadening material or stiffening ribs to it. Perhaps sticking some 
stiff L-channels of aluminum, fiberglass, or something similar to the top of 
the tank using epoxy would help.

-Joe Kuchan

>From: mike.griese@xxxxxxxxxxxxxxxx
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] Fuel Pump Noise
>Date: Fri, 22 Apr 2005 17:35:37 +0000
>
>
>
>Dick - My car does this too, but closer to an empty tank than yours.  I
>have a couple of observations, but no real solutions.  First, is that a
>tank that is less than full makes for a good speaker enclosure.  It's 
>plastic,
>and you have a vibrating mass hanging right at one of the less rigid 
>sections
>of the tank.  Higher temperature seems to help the fuel cavitate better 
>within
>the pump, which increases the noise.  Another thing to note is that the 
>bottom
>of the pump hangs about halfway into the tank, which indicates that the 
>fuel
>itself provides some audio insulation and probably cooling to the pump.  I
>haven't been able to determine if the pickup hose winds up contacting
>the tank.  If it does, that could be another source of noise being injected
>to the fuel tank.
>
>Short of keeping the tank more than half full, it's not much help, but 
>maybe
>it will spark some ideas for solutions...
>
>--
>Mike
>
>
>-------------- Original message from Dick Ryan <deloreanbiker@xxxxxxxxx>: 
>--------------

> > 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.
> >
>







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