Gas topping off - Pontiac GTO Forum
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post #1 of 14 (permalink) Old 11-06-2006, 09:56 PM Thread Starter
 
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Gas topping off

I have followed the manual's advice on not topping off the gasoline. I was wondering if this was something that I really need to do. Any suggestions are appreciated.
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post #2 of 14 (permalink) Old 11-06-2006, 10:00 PM
 
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I think most manuals state that. Insurance reasons.
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post #3 of 14 (permalink) Old 11-07-2006, 01:02 AM
 
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We have a float in our gas tanks that indicates the full to empty on the guage
Basically when you top off you throw the float & guage off
so when your guage says empty you really have a couple of gallons left not counting your reserve.
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post #4 of 14 (permalink) Old 11-07-2006, 08:14 AM
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Garage
I have found that topping off as allowed me to put up to an extra gallon in the tank. It does throw off the calibration on mpg and fuel usage. I noticed if you stop once the fuel pump shuts off the fuel usage is dead on accurate. In my car any how.

Pumping gas when it's cool does seem to fill the tank fuller than when it's done in hotter temps. Topping off does not allow you that much more fuel when pumping in cooler temps. Expansion and contraction....I have noticed this.

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post #5 of 14 (permalink) Old 11-07-2006, 12:59 PM
 
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That reminds me.....I need to go top off my tank.
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post #6 of 14 (permalink) Old 11-07-2006, 05:14 PM
 
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In regards to not overfilling, this deals with expansion and contraction. When the fuel comes out of the ground it is cool. Gas as it heats expands. If you fill the tank completely full and the fuel expands it will push into the filler nozzle. It then goes into the evaporative recovery system and can cause problems for that.
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post #7 of 14 (permalink) Old 11-07-2006, 08:49 PM
 
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It has to do more with emissions than insurance.
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post #8 of 14 (permalink) Old 11-07-2006, 11:09 PM
 
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well when i get gas i just put the pump in and when it stops it full is this bad i haven't noticed any problems
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post #9 of 14 (permalink) Old 11-08-2006, 12:31 AM
 
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Quote:
Originally Posted by fergyflyer View Post
It then goes into the evaporative recovery system and can cause problems for that.
Yep. A you will win a trip to the dealer for OBD work -- which isn't covered under warranty if there's evidence that you flooded the ERS by overfilling. Won't happen when the pump shuts off -- but if you do stuff like pull the vapor recovery hood back and keep filling, or just do the pump and click thing for a while, you'll eventually be sorry.
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post #10 of 14 (permalink) Old 11-08-2006, 07:56 AM
 
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Quote:
Originally Posted by b_a_betterperson View Post
Yep. A you will win a trip to the dealer for OBD work -- which isn't covered under warranty if there's evidence that you flooded the ERS by overfilling. Won't happen when the pump shuts off -- but if you do stuff like pull the vapor recovery hood back and keep filling, or just do the pump and click thing for a while, you'll eventually be sorry.
Evidence?? That would be very hard for a dealership to prove. Unless they had a video tape of the person "topping off", they wouldn't have a leg to stand on in court. If it ever happened to me, I would just claim it was a gas pump malfunction. It would cost the dealer more money in time and labor to "gather evidence", then it would to just fix the problem under warranty and be done with it.

Last edited by hardball75006; 11-08-2006 at 08:26 AM.
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