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Date:         Sun, 28 Jun 2009 13:46:34 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Fuel Filter "Update" Results
Comments: To: Ken Lewis <kdlewis@NORTHSTATE.NET>
In-Reply-To:  <00a801c9f812$b266a160$0201a8c0@korky2>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 01:05 PM 6/28/2009, Ken Lewis wrote: > Lowering the voltage mostly changes the speed and hence frequency emited, >by the fuel pump (I did some experimenting where I ran the engine >electronics off solar powered batteries). It is still just as loud. I am >wondering if the rubber vibration isolation stand-off has hardened over >time. It might be easier to invest time and energy in that area instead.

Right. What I'm proposing would only be useful if the noise was resulting from cavitation arising from inlet restrictions.

From my own experience with clogged inlet filters, the cavitation noise is a high-pitched whine that is clearly audible from ground level alongside the running vehicle, whereas a properly running pump is inaudible or nearly so. Likewise, a correctly running pump cannot be heard from inside with the engine running, while the cavitating pump is clearly audible.

I'm embarrassed to say that on Dutiful Passage I swapped in under warranty from Auto-Zone a perfectly good Pierburg pump (not to mention replacing the original Bosch pump) through not understanding this problem.

-- David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/ '89 Po' White Star "Scamp"


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