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Old 27 Jun 2003, 10:34 pm
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Default Re: Gas mileage changed big time!

One thing everyone missed is the fact that, with time all kinds of garbage
in your tank builds up and sinks to the bottom. Running on an empty tank
causes the fuel pump to suck the crap in and clog your filters, lines and
injectors. If you have a dirty injector, your fuel consumption will be high
too.
The condensation thing I believe, this is why when people with boats store
them for winter, they fill up their tanks, to avoid condensation.

Tony


"john" <rsx18@mistralaero.com> wrote in message
news:3EF3DD83.9040700@mistralaero.com...
> I would have to agree with Gabe, it is not rocket science to understand
> that the fuel column in the tank puts some pressure at the intake of the
> pump, pressure that the pump would have to build itself otherwise.
>
> Also the argument I read about more fuel becoming in fact more cooling
> liquid for the pump could be valid depending on the actual set-up (e.g.
> basically; is the pump outside the tank or kind of inside the tank or at
> least in contact with it so the liquid actually gets a chance to cool it
> down).
>
> Additionally near empty tanks have air in them, thus water (e.g.
> humidity) when the temperature cools down, the water precipitate in your
> tank. Since water is heavier than gas, you might get water drops in your
> motor when you start the engine the next morning.
>
> Basically, all fuel tank (especially where you fuel up your car) intakes
> are above the bottom level. This allows a given amount of water at the
> bottom of the tank. ( in gas stations, they even have gauges the measure
> the amount of water in the tank)
>
> Always driving the car with an empty tank, you raise the amount of
> condensation possible in your tank. It also raise the possibility that
> you go over the limit of water allowed by your tank design. Remember
> there is already plenty of water in the tanks at your local gas station
> ;-)))
>
> Thinking of it, I never worked at a gas station so these could be urban
> legends I heard from a friend who had a friend working at the gas
> station etc...
>
> Anybody with real life gas station experience care to confirm ??
>
> Thanks,
>
> -john
>
> Gabriel Afana wrote:
>
> > It depends on the car Stuart and whether you were lucky enough to get a

good
> > fuel pump, or unlucky to get a defective one. Theoretically, running on
> > empty reduces the live of the pump. By the way, how long have you kept

your
> > cars? You could be driving for 30 years, but if you change cars every 2

or
> > 3 years, I wouldn't expect you to have to change the pump.
> >
> > Gabe
> >
> >
> > "Stuart Gordon" <sgordon0531@rogers.com> wrote in message
> > news:9dMIa.148497$G_.103069@news02.bloor.is.net.ca ble.rogers.com...
> >
> >>you must be wrong, and I have proof.
> >>
> >>I have been driving for almost 30 years and I ALWAYS try to get the most
> >>milage out of each tank, so I ALWAYs drain the tank before I fill up. I
> >>have never run out of gas but I have NEVER replaced a fuel pump.
> >>
> >>My step dad is afraid to run out of gas and never gets below 1/3 tank,

and
> >>his car just had to get a fuel pump !!
> >>
> >>
> >>

> >
> >

>



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