Fw: [DML] Noisy fuel pump

["Chris Parnham" <chrisparnham@xxxx>]

----- Original Message -----
From: "M1" <PWPilot@xxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Wednesday, February 28, 2001 6:09 AM
Subject: Re: [DML] Noisy fuel pump


> Walt;
>
> Re: Noisy Fuel Pump.
>
> I've been through quite a few situations with the fuel pump in '83.
Without
> going into all of the details at this time, I can say that from my
> experiences the fuel pump, when receiving a sufficient supply of fuel runs
> very quietly. The only time mine makes any real amount of noise is when
the
> pump itself is starved for fuel. The fuel starvation at the fuel pump
inlet
> causes cavitation ( air bubbles ), and these passing through the pump are
> what makes the noise.
>
> The cause of this on my car was bad parts in the fuel tank supply system:
> defective filter material on the fuel tank baffle, and collapsed fuel hose
> from tank baffle to the pump. The noise, in several episodes of fuel
system
> problems, was always the first sign of impending fuel pump failure.
>
> Interestingly enough the fuel pump itself is actually cooled by the fuel
> passing through it, and is a significant source of heat. The pump draws
> about six amps: this results in about 60 watts of heat added to the fuel
> over time. Strange as it may seem, the fuel actually passes directly over
> the pump motor armature and the commutator brushes. The reason that this
> does not cause an explosion is because the pump body is hermetically
sealed,
> and with no way for air to get in there can be no problems.
>
> George Ryerson
>
>
>
> -----Original Message-----
> From: Scott Cagle <sharkywtrs@xxxx>
> To: dmcnews@xxxxxxxxxxxxxxx <dmcnews@xxxxxxxxxxxxxxx>
> Date: Tuesday, February 27, 2001 10:52 PM
> Subject: Re: [DML] Noisy fuel pump
> >
> >Walt;
> >
> >I had the same problem this weekend. During the meeting of the ETDOC, at
> the very tail end of the trip, mine started making some noise.
>
>
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