On Thursday, August 4, 2016 at 3:59:38 PM UTC-4, dpb wrote:
I haven't had one apart, but unless it follows a float down or similar,
what you say is logical. The only advantage I see to not filling all
the way is reduced weight, but that isn't going to make much difference
More full is always better. Fuel systems are better sealed these days
but condensation was always a consideration. Ethanol added helps in
that regard too.
I usually fill at 1/8 to 1/4 but have to fill up every 5 or 6 days so
Fuel has been improved too with better additive packages and filtration.
If you use cheap unbranded gas, use a top tier every few fillups and
you will get some benefits.
if you run your tank dry, run out of gas it can and does damage the fuel pumps located in the tank. that can cost 600 bucks and more to drop the tank and install new pump
the pumps use the gasoline to cool the pump.
Much depends more on the season. In winter, more than half to avoid
condensation which doesn't build up as much in the summer. Otherwise, I
don't think it makes much of a difference.
Every car I've owned (all pre 2000 models) was driven until the low fuel
indicator illuminated and I've never had a problem with pumps or
anything fuel related. That was also done all year long regardless of
weather here in Mich. I don't think it's as much of an issue as some
E-10 gasoline phase separation is your enemy.
Humidity, daily temperature swings and how well your fuel tank is sealed are big factors.
Will phase separation occur in your trucks tank? No one here can actually tell you.
Some theorize that keeping the tank full is better, some say it doesn't matter.
Some would suggest using ethanol-free gasoline.
Some would suggest using an additive like Sta-Bil.
If phase separation occurs, how much will the repair costs be for your truck?
How luck do you feel?
Actual documented evidence of such over typical short durations between
I've a number of vehicles that get intermittent use that sometimes go
several months and have never experienced such.
Of fresh (uncontaminated) fuel in a vehicle tank, that is, certainly
it's possible owing to contamination in USTs and the like...
Well, let's see -- yeah, if I work out the volume of water entrained in
the 10 gal of a half-empty 20 gal tank assuming 100% RH @ 60F and 1
atm., I get it's roughly 1.3E-5 gal. The roughly 0.5% by volume
required for phase separation equates to 0.005 gal so fully saturated
air if all condensed to water would be only about 0.25% of that required
to cause phase separation.
I'm thinking it's a non-issue...
See the follow-up; the point was asking if OP had any evidence of it in
a vehicle, _NOT_ in UST or thru deliberate or accidental introduction of
water but by condensation.
I went ahead and did some calc's; it's essentially impossible starting
from uncontaminated fuel to introduce sufficient water volume that way.
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