Boiling point of gasoline.

[krue0101]

Hello,

I was wondering if anyone could tell me where to find the boiling point of unleaded gasoline at different pressures? I am really interested in the boiling point of unleaded gasoline at 35 psi, but would also like to find a source for other pressures.

Thank you,

Joe

 

[Retracnic]

Krue0101,

Your question is not as simple as it would seem. The problem is that unleaded pump gasoline (or petrol if you prefer), is a combination of many different compounds, each with its own physical properties. The various oil companies have their own proprietary blends that vary from region to region and by season of the year.

A liquid is said to be boiling when its vapor pressure exceeds atmospheric pressure. That's why boiling temperatures increase with added pressure, and decrease when pressure is removed. The different hydrocarbon chains that may make up pump gasoline have boiling points ranging from as low as 10 degrees F, all the way up to over 600 degrees F. Without knowing the exact composition of the fuel, an accurate boiling point can not be predicted.

Regards,

Bryan Carter

 

[Andy330hp]

That is true. Depending on the time of year, gasoline can have reid vapor pressures anywhere from 6 psi to 15 psi. So, you really need to know what you're dealing with first. That being said, here's a helpful link

http://www.blackmer.com/myapp/pdf/bul50.pdf

Unfortunately it does not go as high as you would like, only 20 psi. And, I think it's pretty old info, so don't rely too heavily on it

 

[krue0101]

Thank you very much for your expertise. What I am really trying to determine is how high of a gasoline tank temperature I can have before having trouble pumping it into a fuel injected engine. I now realize that this is a very complicated question, but I am only looking for a worst case number or a rought idea.

Thanks again for all your help.

 

[roadwarrrior77]

In my opinion, if you're trying to vaporize or "boil" gasoline, you would be much better off switching to a simpler carb setup. The amount of heat needed to boil at 35 psi really exceeds practicality.