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Bob:: That's what makes airplanes fly, lower atmospheric pressure on the top of the wings than on the bottom. As those fuel cap gaskets age they get harder than a rock, and an ill fit between the cap and neck will exacerbate the low pressures. As will angle of attack. If after tightening up the seal if the leakage persists, push the nose over and climb out at a lower rate of climb, but with a higher speed. This usually only happens when the tanks are full. Wayne ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, September 11, 2003 2:19 PM Subject: [COUPERS-TECH] Re: Digest list: Ercoupe Technical Discussion (moderated) > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Hi All: > We have 4 days of the best weather I've seen in a long time with what looks like 100 mile visability at least you can see the horizon Anyway I need some advice from the group; I just went to an airport 10 min (20 miles) from my base and filled the wing tanks to within a 1/2 inch of the top. (Total of 12 gal) The header tank was ABOUT 3/4 FULL. ON TAKEOFF I NOTICED FUEL BEING SYFONED FROM THE LEFT TANK FROM UNDER THE CAP , After landing back at mt airport I measured the fuel level and it appears that I lost about 3 gal of fuel from the left tank. > I checked the pin hole cap vent and ther both open. This plane does not have a mechanical pump. only a electric pump located on the firewall and was placed in the system where the mechanical pump was removed and works fine. It was done legally with all paperwork by previous owner. I first noticed this problem last Sunday on a 3 hr flight to PA after refueling with the fuel pump pumping. It stopped leaking after about 2-3 minutes when I turned the pump off and burned off some fuel. After this current refueling it appears to continue with or without the pump on. This is not only costly with the price of fuel but could be deadly. . There are new gaskets on the caps but the leaking cap is not quite as tight as the right one that requires a pair of pliers to remove. Do you thing switching sides with the caps to see if the cap is the problem, is a good idea > Any advice would be aprecated > Bob Bullock > 1966 Alon N5521F > Maryland > > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > ========================================================================== ==== 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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