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Maybe that's it. Consider: - Fuel levels and pressures in all tanks are normal and atmospheric. - During the day, as temperatures rise, the air and gasoline in the tanks heat and expand. - The header tank can harmlessly vent air out its pinhole vent; but my wing tanks have no vent. The only openings they have are the supply line to the header tank (through a valve and a pump), and the return line between header tank and wing tank(s). I don't know if both wing tanks are connected to the header; or if the wing tanks are connected between themselves, and then one wing tank to the header. - The supply line always has gasoline in it because it must be at a low point in the wing tank. - The return line has gasoline in it, but connects at high points in both tanks, right? It must be so from the header tank, but perhaps not at the wing tank. This makes a crucial difference. If the return line connects low at the wing tank, then the wing tank, when its air and gasoline heat and expand, will push gasoline into the header; but if the return line connects high, then it should push air into the header, if not plugged. If plugged, the only outlet is the supply line, which will always have gasoline. > From: "Wayne" <[EMAIL PROTECTED]> > To: "R M Finch" <[EMAIL PROTECTED]>, "'Ercoupe Technical > Discussion \(moderated\)'" <[email protected]> > Reply-To: "Wayne" <[EMAIL PROTECTED]> > Subject: Re: [COUPERS-TECH] Re: Alon Fuel Caps > > Hi Ralph:: > > I went to an impeccable resource to obtain the answer (Ask > Jeeves) Who > sez:: the density of gasoline will change with increasing > temperature since > its volume increases but not its mass. > I would think that the overflow vent in your Alon is plugged > or sumpin. The > overflow vent is visible just below the neck in the header tank. ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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