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Vapor pressure in gas tank? 700 1987

posted by  SpazMan on  Fri Jul 24 04:57 CST 2009
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last visit: Tue Aug 14 21:06 CST 2012
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Hi folks,

This is one of those times when I simply do not know how a perfectly running Volvo 740 is supposed to behave. I just got through with a test drive after replacing a fuel line and repairing some leaks in the rubber boots on the hard plastic lines.

Good news is that I no longer smell gas from the rear wheel well, nor when I take the in-trunk access panel off. Everything appears tight and dry. One thing I have noticed is that I don't get a 'pssst' when I open the gas cap. Other cars I have used always had a little vapor pressure behind the gas cap after running.

I assumed the lack of pressure behind the cap was because the pressure was vented by the leaks. Now, I am wondering if I got all the leaks. Is there a mechanism in the Volvo system that prevents vapor buildup?

Thanks!

Ari








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    Vapor pressure in gas tank? 700 1987

    posted by  Klatu on  Fri Jul 24 07:05 CST 2009
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    last visit: Fri Oct 17 21:22 CST 2014
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    Some cars have to have an certain amount of fuel in them before the evap system actuates. Sometimes mine makes a sound, sometimes it doesn't. It is only a vapor return. On newer cars, if the evap system malfunctions in any way. A code will set. Check engine light will come on.







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