Topping Up Fuel Tank

I just acquired a copy of the manual for my 1999 Hyundai Accent GSI
and it says you should not top up the tank when refueling.

What's the rationale behind that?

Chris

 

All cars say that now. It has to do with the emissions system. You need
some airspace in the tank for the recirculation system to work properly. .

 

So you agree that you shouldn't top up?

Chris

 

Right. The few extra ounces you get in the tank may cause the check engine
light to come on if nothing else. I've had that happen with my Buick.
While it did not cause a mechanical problem, it was an un-needed annoyance.
Sometimes the engineers know what they are talking about.

 

HOLY CRAP! Maybe that's why my Check Engine light comes on all the
time after refuelling!

Chris

 

**There's that and not turning the gas cap enough. My Mom's XG350 has
thrown that light a few times and it was due to the cap not being
tightened enough.

kaboomie

 

I always thought it was that but maybe it was because I always top up
the tank!

Chris

 

Reply to message from "Edwin Pawlowski" <> (Fri, 23 Feb 2007
14:24:30) about "Re: Topping Up Fuel Tank":

EP> Sometimes the engineers know what they are talking about.

Hah! We always know what we are talking about, especially when it comes to
our products. ;-)

Best Regards
Wayne Moses <> Fri, 23 Feb 2007 18:46:16 -0600

=== Posted with Qusnetsoft NewsReader 3.3

 

Actually, those are not the engineers talking, those are the stupid
politicians forcing every manufacturer to install expensive devices to
protect some Owls in in Oregon.
If they removed all that emission crap, the increase on efficiency and
lower gas use will make better for the environment, but of course, then,
big oil will not make record profits, and Detroit will not sell a single
car ... fat chance of that happening.

 

Too much gas and you can flood the vapor recovery system.

Matt

 

Yes. When the pump shuts off automatically, you shouldn't add a lot
more fuel. After the pump kicks off, I tend to run up to the nearest 10
cents and then stop.

Matt

 

Damn I always fill it til it overflows a little to prolong my not
having to fill up.

Guess you learn something new everyday!

Chris

 

Yes, you learn that it pays to ead your owner's manual when you get a
new car!

Matt

 

Had that happen on wifey's 2003 Tib. Was on a short trip one day, and
the check engine light came on. Dropped her at the store and went to
the dealer to find out the cause. Turns out that she and daughter (both
blondes, incidentally) had failed to screw the gas cap in properly after
last fuel stop!

 

Vic Garcia wrote:

AMEN!!!!!

 

Wow, two clueless folks in a row.

Catalytic convertors and related pollution controls remove something
upwards of 90% of the pollutants that would otherwise be emitted. To
make that up with better mileage alone would require that cars get 10
times better fuel mileage without the pollution controls. You can
believe all of the gimmick ads you want, but thermodynamics precludes
this happening.


Matt

 

Actually, you are the one more or less, clueless, you only took into
account the local effects, not the global ones.

First, that figure of 90% is way out of real life values; it's more like
40%, most of he improvements came from better and clean gas.
Second, while in a big engine (Detroit type) the lost of power is around
20%, in a small, more efficient one it can be near 50%, a big hit on gas
use, I did owned 3 Ford Fiestas, 2 Europeans: 0.9L, 1.1L and 1 American:
1.6L with all that junk in .... result:
less power than the small euro engine, 40% more gas used .....
Third, all the emission junk add: weight (more gas to move it), more
parts to break (more money out of your pocket) and a lot of pollution in
the places they are manufactured (catalytic converters use rare metals
as the catalytic agent), while that does not affect you or me, locally
it's there in the planet, and we ALL have to share it.

In a global perspective those devices, create more pollution than what
they prevent.
Same thing apply to the hybrids, the battery manufacturing plants
generate more pollution making the first set of batteries, than what the
car will save over their life ... so what's the point ??????

Simple, it's not in my backyard, the polluting materials are made on
another countries .... well, we are Earth citizens, mother Nature will
get back to us eventually.

 

Amen??? Hell, cars today last years longer and go hundreds of thousands of
miles as a standard expectation. The great cars of yesteryear didn't
approach the longevity and reliability of today's cars. Nor did they
approach the fuel mileage. Now, I'm with ya if you really miss the big
block torque and HP of days gone by, but that's a lot different than what
the OP stated.

 

Continued fueling after the automatic pump shutoff can force fuel into
the vapor control system. That, in turn, can prevent the vapor
control system from working properly, and cause the ECM to illuminate
the check engine lamp

 

We actually didn't get an owner's manual when we bought this used
car. I just bought one on Ebay.

Chris