----- 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. > > > Before posting messages or replies, see the posting policy rules at: > www.dmcnews.com/Admin/rules.html > > To address comments privately to the moderating team, please address: > moderator@xxxx > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > >