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Old 09-15-2007, 06:53 AM
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Don Moyer Don Moyer is offline
 
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Bob,

You pose a very important question in my view and I hope others will contribute.

I'm not a hydraulics expert either, but we do know that the vapor pressure of gasoline is quite high which means that it doesn't take much of a pressure reduction from normal atmospheric pressure before evolved gas will start to come out of solution and create bubbles. When the reduced pressure equilibrates, I believe the evolved gas goes back into solution, but I'm not sure if it passes back and forth from solution at the same pressure; i.e., it may take positive pressure above normal atmospheric before the evolved gas will go back into solution.

I believe it is also true that the vapor pressure of gasoline becomes higher as temperature rises, which means that if you do have any restrictions in the fuel supply line from the tank, the tendency for gas to evolve out of solution would be worse in the heat of summer. This is probably what oldtimers used to call shutdowns from "vapor locks".

Don
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