Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

Why doesn't gas evaporate anymore?

Welcome Guest, Log in or Register
Author 
Dieselrider

10-23-2003 17:22:47




Report to Moderator

I have noticed that the gas at the pump does not evaporate like it did in years past. Why is that? It used to be that if you put gasoline in an open container overnight it would start evaporating right away, and be gone in a day or two. Now if you put gas in an open container,to clean out paint brush or whatever, it stands in there for days on end- takes a week or so to evaporate. Is it the alcohol? I would think that would evaporate quicker. What else are they putting in it or taking out of it?

[Log in to Reply]   [No Email]
Buzzman72

10-24-2003 07:39:08




Report to Moderator
 Re: Why doesn't gas evaporate anymore? in reply to Dieselrider, 10-23-2003 17:22:47  
Part of the reason has to do with environmental concerns and emissions control. On old equipment, such as antique tractors, there was no vapor management system, charcoal canisters, purge valves, and the like; consequently, gasoline vapors would be vented into the atmosphere, where they would dissipate as they were diluted by good old air. Nowadays, the EPA says that's not good enough...and since they can't recall 60-year-old tractors and lawn mowers to put evaporative emission equipment on 'em, they've coerced (as in "BIG fines") gasoline refiners to make gasoline less easily vaporized. I think the term I'm looking for is "Reid vapor pressure," but I'm a little rusty on that part of my high school science education.

[Log in to Reply]  [No Email]
MarkB

10-25-2003 03:15:32




Report to Moderator
 Re: Re: Why doesn't gas evaporate anymore? in reply to Buzzman72, 10-24-2003 07:39:08  
One good thing about the lower vapor pressure is that it reduces vapor locking. That's why many aircraft today can use unleaded car gas in place of 80/87 octane avgas.



[Log in to Reply]  [No Email]
Robert in W. Mi

10-27-2003 12:27:49




Report to Moderator
 Re: Re: Re: Why doesn't gas evaporate anymore? in reply to MarkB, 10-25-2003 03:15:32  
I'm not sure why you said "today"? 30 years ago i was flying all over the Alaskan bush along with all my friends, and that's all we ever used!!! I never heard of anyone haveing problems, as long as you kept your cans clean!! Robert



[Log in to Reply]  [No Email]
JOHN (LA)

10-24-2003 14:22:53




Report to Moderator
 Re: Re: Why doesn't gas evaporate anymore? in reply to Buzzman72, 10-24-2003 07:39:08  
Yes you hit the nail on the head!!
RVP a standard by which all gas is made now a days. More so in the summer. Your town goes through a air quality test and from this test the EPA sets standards on your towns RVP.
Towns with a very low RVP will also have vapor recovery on the gas pumps. (A rubber boot around gas nozzel)



[Log in to Reply]  [No Email]
Mike (WA)

10-24-2003 08:43:32




Report to Moderator
 Re: Re: Why doesn't gas evaporate anymore? in reply to Buzzman72, 10-24-2003 07:39:08  
The more cynical among us might surmise that its simply that the gumming agents they are now adding do not evaporate very readily. If they did, they couldn't hang around my carburetor and do their work. And you learned about "Reid vapor pressure" in high school? Only thing I remember about Reid from high school is that she was that racy looking cheerleader (the little blond on the end) that my folks wanted me to stay away from.

[Log in to Reply]  [No Email]
Miss Grundy

10-25-2003 03:51:06




Report to Moderator
 Re: Re: Re: Why doesn't gas evaporate anymore? in reply to Mike (WA), 10-24-2003 08:43:32  
Yes, Those were the good old days! I think I remember you playing forward! Thought you had forgotten.



[Log in to Reply]  [No Email]
Stan TN

10-24-2003 21:43:12




Report to Moderator
 Re: Re: Re: Why doesn't gas evaporate anymore? in reply to Mike (WA), 10-24-2003 08:43:32  
And being a dutiful son you complied with your parents wishes. Didn't you? Uh-huh. ;-)



[Log in to Reply]  [No Email]
Indydirtfarmer

10-24-2003 03:59:45




Report to Moderator
 Re: Why doesn't gas evaporate anymore? in reply to Dieselrider, 10-23-2003 17:22:47  
Two things. If you don't think gas evaporates, you ought to see how it disappears from my pick-ups fuel tank! And then, did I hear you say "using gasoline to clean paint brushes"? Shame, shame shame.



[Log in to Reply]  [No Email]
Dieselrider

10-24-2003 19:32:04




Report to Moderator
 Re: Re: Why doesn't gas evaporate anymore? in reply to Indydirtfarmer, 10-24-2003 03:59:45  
Yes, I said, use gas to clean paint brushes and it works quite well as a cleaning agent on such things. Unless it happens to be water based paint that is. So don't get all puckered at both ends.



[Log in to Reply]  [No Email]
buickanddeere

10-23-2003 19:31:14




Report to Moderator
 Re: Why doesn't gas evaporate anymore? in reply to Dieselrider, 10-23-2003 17:22:47  
It's for less hydrocarbon emissions.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy