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Benson · 07-19-2010, 12:00 PM

Marc,

Is it possible that you are using gasoline from last winter or have recently filled up from a station with a low volume of gasoline sales? Maybe the station is still selling "winter gas" in the storage tank!

What I am getting at is if the gas you are using is "winter gas" ... it will boil at a much lower temperature and cause vapor lock or vapor bubbles in the system at a lower temperature.

On a 95 degree day recently I opened a 5 gallon GI can of "winter gas" and as soon as I relieved the pressure the gas started to boil and continued to boil in the GI can for 3 or 4 minutes.

Cars with fuel pumps have less vapor lock problems compared to gravity feed systems because of the pressure the pump creates prevents boiling at a given temperature Just like the gas in my GI can did not boil until I relieved the pressure when I opened the can.

07-19-2010, 12:00 PM	#16
Benson Senior Member Join Date: May 2010 Location: Central Highlands, Cen~Col Posts: 2,896	Re: Vapor Lock 101 ? Marc, Is it possible that you are using gasoline from last winter or have recently filled up from a station with a low volume of gasoline sales? Maybe the station is still selling "winter gas" in the storage tank! What I am getting at is if the gas you are using is "winter gas" ... it will boil at a much lower temperature and cause vapor lock or vapor bubbles in the system at a lower temperature. On a 95 degree day recently I opened a 5 gallon GI can of "winter gas" and as soon as I relieved the pressure the gas started to boil and continued to boil in the GI can for 3 or 4 minutes. Cars with fuel pumps have less vapor lock problems compared to gravity feed systems because of the pressure the pump creates prevents boiling at a given temperature Just like the gas in my GI can did not boil until I relieved the pressure when I opened the can. Last edited by Benson; 07-19-2010 at 12:06 PM.