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why stop filling tank first time pump stops?

727 Views 12 Replies 12 Participants Last post by  vwgolfer, 
S
according to the owner's manual, when filling the gas tank, you should not add more gas after the pump automatically stops -- anyone know why?
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Re: why stop filling tank first time pump stops? (scooter4343)

because the gas needs expansion area and if you fillup more than when the pump stops the gas could thoretically cause more emissions and something else I don't remeber.
It's not like you can fit much more gas in, I don't get why people fill after the pump stops.
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Re: why stop filling tank first time pump stops? (landrumdh)

BOOM!
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Re: why stop filling tank first time pump stops? (Matchschtick)

Adding gas after the pump stops wastes the gas you add. Can't remember why exactly.
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Re: why stop filling tank first time pump stops? (Bob Roberts)

I too thought the manual was full of crap. So I confidently pumped some more, just like I do for my 1989 Cavalier! Two seconds later gas came spewing out of the hole and down the car and onto my shoes.
THAT'S why.
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Re: why stop filling tank first time pump stops? (Red00GTI)

quote:[HR][/HR]I too thought the manual was full of crap. So I confidently pumped some more, just like I do for my 1989 Cavalier! Two seconds later gas came spewing out of the hole and down the car and onto my shoes.
THAT'S why.
[HR][/HR]​
Same here but my car was 5 days old and spilled all over the paint.
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Re: why stop filling tank first time pump stops? (bastion72)

LOL...I kept going after mine clicked off....
it kept going a whole GALLON!!!
I wondered why I was getting crappy gas mileage......
I was a gallon short each tank.
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Re: why stop filling tank first time pump stops? (scooter4343)

i filled up for the first time today and i didn't top it off when it stopped and it didn't register full on my gas gage. any thoughts???
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EPilot
Re: why stop filling tank first time pump stops? (greenplaid5)

Was your car running while you filled it?
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Re: why stop filling tank first time pump stops? (EPilot)

no, it wasn't running.....
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Re: why stop filling tank first time pump stops? (greenplaid5)

quote:[HR][/HR]I filled up for the first time today and i didn't top it off when it stopped and it didn't register full on my gas gage. any thoughts???[HR][/HR]​
I have this same problem the last two fillups, and no my car was not running. The fuel gauge pointed to 3/4 tank and I only noticed it after pulling away from the station. Drove to work (20 miles) and filled it up again, guess what, I got 4 more gallons in!!!

Don't know what's going on, never happened before.
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Re: why stop filling tank first time pump stops? (Red00GTI)

quote:[HR][/HR]I too thought the manual was full of crap. So I confidently pumped some more, just like I do for my 1989 Cavalier! Two seconds later gas came spewing out of the hole and down the car and onto my shoes. [HR][/HR]​
pumping your own gas? barbarians...
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Re: why stop filling tank first time pump stops? (landrumdh)

quote:[HR][/HR]because the gas needs expansion area and if you fillup more than when the pump stops the gas could thoretically cause more emissions and something else I don't remeber.
It's not like you can fit much more gas in, I don't get why people fill after the pump stops.[HR][/HR]​
The fuel expands in hot weather, and this expansion needs somewhere into which to expand. If that area in already full of fuel, the fuel will spill out, wasting fuel and causing unnecessary environmental pollution.
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