| vapor pressure in fuel tank [message #138611] |
Thu, 11 August 2011 22:47  |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma:
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Driving through southern Utah today the temperatures were in the low 90s and we had altitudes that ranged from 5000 to more than 7000 feet. At a couple of points along the way we had minor symptoms of fuel starvation consistent with vapor lock but I did not believe it because since I installed the full time electric fuel pump I have not had a problem while driving (restarting a hot engine is the only symptom these days) no matter the outside temps or altitude.
My wife suggested that we loosen the gas cap - her brother's idea - and since I had just read about someone else having a gas cap issue I decided to give it a try. After about 100 miles since the last fillup we stopped at a rest area and I loosened the gas cap. I immediately heard the rush of air I expected but it was a rush of air - and hot gasoline - out of the tank and all over my hand. I quickly put the cap back on and then slowly released all the air. If I tried to let it out too fast I got gasoline again. It took at least a full minute and maybe more to slowly release all of the pressure.
The confusing thing is that my vent line to the fuel/vapor separator in the rear driver's side wheel well is open to the air. I know this because fuel coming from it during a fillup is my signal that the tanks are pretty full.
Any ideas or suggestions as to why this happened?
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
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