This should help you - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Lounge For casual talk about things unrelated to General Motors. In other words, off-topic stuff. And anything else that does not fit Section Description.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-20-2007, 10:22 PM   #11
Senior Member
True Car Nut
 
Join Date: Dec 2005
Location: August 07 COTM....NEBF '06, CEBF '06 OHMM '06 ONBF '07 CEBF '07
Posts: 4,064
Thanks: 0
Thanked 0 Times in 0 Posts
PRD2BDF is on a distinguished road
Default

Quote:
Originally Posted by EagleKammback
I don't know about you, but on my dad'* last truck, there was a ton of stuff at the bottom of the tank,
Could be corrosion, or mismaintance if the truck was used before your dad brought it, or a junkyard unit. There are a lot of variables, you can't just blame it on gas entirely.
PRD2BDF is offline   Reply With Quote
Old 08-20-2007, 10:23 PM   #12
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by EagleKammback
I think I'll expand a little bit of this
#1) 1 gallon of gasoline at 100degF will shrink to 0.976 gallons (almost 2-1/2%) when cooled to 60degF, the supposed standard temperature for calibration. While I don't think the temperature of the gasoline in an underground tank changes very much on a day-to-day basis, there is the consideration of the tanker truck that has just dumped a warm load into the underground tank, and also the ambient temperatures that the gasoline is exposed to while in the above-ground portion of the pump itself.
Our friends north of the border (Canada) have temperature-compensated pumps, and I hear the big complaint is that since the average annual temperature in a lot of places is well below the 60degF standard, they are getting short-changed as compared to not having temperature correction.

#2) If the underground tank has not been maintained, there is also probably some significant water that has accumulated through condensation, settling to the bottom hopefully below the level of the pick-up tube. The unloading operation could also stir the water up in addition to the crud.

#3) Back in the early days when fuel pumps were first put into tanks, I was advised to keep at least a quarter-tankful to keep the fuel pump submerged so it would run cooler and last longer. I don't know if this is still valid advice, but I sure don't want to think about a hot fuel pump in a pool of gasoline!
#1 Ever notice the calibration sticker on the pump? It means something. Standard tolerance is 0.2% REGARDLESS OF TEMPERATURE. This means out of every 10-gallon purchase, you are gauranteed 9.98 gallons of gas REGARDLESS OF TEMPERATURE. Doing the math, this means the most you can be shorted on your 10-gallon purchase at $3 per gallon is 5.7 cents. The DIFFERENCE in that ten gallon purchase is only 0.019 gallons if the calibration of the pump is off by the maximum allowable amount.

#2 When was the last time you had water in your tank that you could attribute to contaminated fuel? If it were bad enough, there would be a public knowledge and media event regarding it from a particular station. Have you ever mixed gasoline and water? Have you ever observed how quickly they seperate? Pour vegetable oil in the sink to experience it on a safer less-smelly level.

#3 I already stated this above, if you read my replies. However, a hot pump in a pool of gasoline won't do much for several reasons. Gasoline has a flashpoint of 246 degrees F. And that'* only going to combust if there'* OXYGEN as well. But in this case, your fuel tank doesn't have sufficient oxygen to complete the combustion. Combustion requires 3 elements. FUEL, OXYGEN, and HEAT. Take one away, and it can't happen. Your automotive design Engineers are very good. They took away the oxygen part of the equation, and dramatically reduced the heat portion.

http://en.wikipedia.org/wiki/Combustion



There are many myths and misunderstandings on this topic.
willwren is offline   Reply With Quote
Old 08-20-2007, 10:27 PM   #13
Senior Member
Certified Car Nut
 
Join Date: Apr 2004
Location: Quincy, Ma
Posts: 15,341
Thanks: 0
Thanked 0 Times in 0 Posts
Gumball is on a distinguished road
Default

Kyle, are you going to keep quoting everything from other forums?
Gumball is offline   Reply With Quote
Old 08-20-2007, 10:29 PM   #14
Senior Member
Posts like a Camaro
Thread Starter
 
EagleKammback's Avatar
 
Join Date: Jun 2007
Posts: 835
Thanks: 0
Thanked 0 Times in 0 Posts
EagleKammback is on a distinguished road
Default

Not everything, I thought what I first posted was true. I like to post things on several forums to confirm or bust any info I come across
EagleKammback is offline   Reply With Quote
Old 08-20-2007, 10:32 PM   #15
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Perpetuating information on the internet like this serves several purposes:

1. It perpetuates potentially false information.
2. It costs someone else time to dispel the falsehood.
3. It costs everyone else that believes it time or money.

Do yourself a favor and:

1. Don't believe everything you read or hear.
2. Expand your mind and research the claims yourself to decide if they're truthful enough to be worthy of posting here.
3. Spend more time learning and less time on the net.
4. Question EVERYTHING at least at first.
willwren is offline   Reply With Quote
Old 08-21-2007, 02:17 AM   #16
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

My dad is a senior manufacturing engineer( and used to be a plant manager) for the Xerxes corporation. The largest underground fiberglass gas tank manufacturer in the US, among their other products. They've pretty much got the entire fiberglass market to themselves, and have been an industry leader for decades.

I've been inside tanks being built, and whatnot, i've moved their offices around by hand for carpet installation as well, i've read product info, and seen first hand.

There'* no membrane in there at all.... There really isn't much maintenance to them either, sure there are issues with rocks, bad digging, componentry put in the tanks, etc, but they have a long service life. As mentioned above, the ground temperature is pretty constant as well, these things are 2 feet from the surface either...

I don't really like to fillup when a tanker is there dropping his load, but if I have to fillup, i will. You have fuel filter for a reason too... My dad taught me this one, i figured he knows wtf is going on...

As mentioned, modern EFI fuel pumps are cooled by the liquid (this case gasoline) they're submerged in. running 1/4 full will pretty much guarantee even with sloshing, turning, etc it will be covered.

Although I could ask my dad any questions about this too if anyone is unclear about something..
BonneMeMN is offline   Reply With Quote
Old 08-21-2007, 11:31 AM   #17
Senior Member
Posts like a Turbo
 
Join Date: Dec 2006
Posts: 386
Thanks: 0
Thanked 0 Times in 0 Posts
thunderhand is on a distinguished road
Default

hey willwren,, you should work for mythbusters ..
thunderhand is offline   Reply With Quote
Old 08-21-2007, 02:14 PM   #18
PopaDopaDo
True Car Nut
 
popatim's Avatar
 
Join Date: Jan 2005
Location: NY
Posts: 4,957
Thanks: 0
Thanked 0 Times in 0 Posts
popatim is on a distinguished road
Default

Regarding #4, I believe that pumping in the slow mode will result in getting a more accurate gallons being pumped than in fast mode; ie in fast mode you will get less gas than the pump reads. I know this used to be the case years ago but I'm not sure on the modern pumps. Can anyone confirm or deny this?
popatim is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
How should i position my subs and how should i wire them in a 2000 bonneville? zachattack2795 Audio (and aftermarket electronics) 5 11-24-2010 11:18 PM
Should I stay or should I go? 2000SilverBullet Lounge 25 02-16-2008 06:55 PM
Should I stay or should I go? CJCroel Lounge 8 09-29-2007 07:36 PM
Why you should never take your husband shopping with you lash Lounge 12 06-01-2006 04:47 PM
Should i stay or should i go... (mature) mike_peperni Your Other Rides: Pics & Videos 8 01-04-2006 06:46 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:45 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.