"hachiroku" <Trueno@ae86.GTS> wrote in message
newsan.2008.06.02.14.33.51.578000@ae86.GTS...
> On Mon, 02 Jun 2008 05:53:18 -0700, jim beam wrote:
>
>>> It's like every "factual" story in the media is just all spin. So, is
>>> this
>>> guy an Oil Company shill trying to get us to fill-up and inflate the
>>> price
>>> of gasoline?
>>
>> no, that could /never/ happen. not ever. not in a million bajillion
>> years. no sir.
>>
>> oh, wait, the fuel pump thing is utter bullshit, so...
>
>
> Once again you show how little you know.
>
> The fuel pump is cooled by fuel. If you run on a low tank that doesn't
> cover the fuel pump, it can fail prematurely. At $190~425 for a fuel pump.
> it's probably cheaper to keep enough fuel in the tank to cool the pump.
>
> What did I expect from someone who changes his oil at 12,000 miles whether
> it needs it or not.
>
> Reply when you get a clue...
>
>

Sorry to burst your bubble hachi but the level of fuel outside the pump
means nothing. As has been mentioned before the fuel being pumped goes
directly through the motor assembly on its way from one end of the pump to
the other. This means the armature, commutator, brushes, and field magnets
are all constantly bathed in flowing fuel while the pump is on. Typical
construction is a steel tube containing the magnets which is crimped onto 2
end caps. The bottom end cap contains the turbine (TBI) or gerotor (MPI)
pump and the top cap contains the fuel outlet, check valve, electrical
terminals, and brush holders. The pressure relief valve that protects the
pump from being dead-headed from a plugged filter or a kinked fuel line is
also in one of the 2 caps. I have also seen pumps that were all plastic. I
haven't designed pumps but I have taken apart a half dozen failed ones.

All that being said I have also personally heard the distinct sound of vapor
bubbles going through the fuel pressure regulator on a car with the engine
running. I think in some cases the pump starts sucking air through the top
of the pickup sock before the tank is completely empty but yet is still able
to supply enough pressure and volume for the engine to run.


P.S. Why is this cross posted to about a zillion newsgroups?