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I have a 1965 Alon with latching fuel caps on the wings, no air vent. They do not screw on, rather there is a latching or clamping mechanism which secures the cap to the tank. The header tank is vented and twists on. I don't know if the wing caps are standard or not. Since the wing tanks don't vent through the caps, they must vent through the supply and/or return lines. This results in pressurized tanks and oil-canning sounds when I loosen the caps and relieve the pressure. No damage noted anywhere so far and none expected, it's probably been that way for years. When the plane sits in the summer, even in a shade hanger, I get fuel spillage from the header tank cap as the wing tank contents expands and vents through the header tank. My solution to that has been to loosen the wing tank caps so the air can vent directly. The left side cap is fussy about being clamped on just right. If not, when I take off I can see fuel leaking and evaporating from the cap. I've several times had to land and adjust it. Fortunately I can do this without getting out of the plane....probably I could do this even while flying, but it seems risky and I've never tried. I should replace the gaskets probably. Ralph Finch > From: [EMAIL PROTECTED] > To: [email protected] > Reply-To: [EMAIL PROTECTED] > Subject: [COUPERS-TECH] Re: Digest list: Ercoupe Technical > Discussion (moderated) > > Someone on this form reciently told me that the 1966 alon > fuel caps were not vented and if they were I should plug the > vents. I also am having fuel overflow problems. Are the > caps different different on the 415 Models. If the advice > was incorret I don't want to pull a vac.and damage the tanks > and/or run out of fuel Please strighten me out. > Thanks > Bob Bullock > N5621F > Maryland > > ---------------------------- > From: "Wayne" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>, <[email protected]> > Reply-To: "Wayne" <[EMAIL PROTECTED]> > Subject: Re: [COUPERS-TECH] Re: Digest list: Ercoupe > Technical Discussion (moderated) > > Bob:: > > 1.) Ercoupe and Aircoupe fuel caps are different. > 2.) There are at least 5 different fuel system > configurations through the aircraft's lifetime. > 3.) there is little chance of collapsing the fuel tanks with > a fuel pump vacuum. > 4.) if you have 4 quick drains on the belly and a center > firewall mounted gascolator, you have an Alon system. > 5.) you should have the maintenance manuals for your > airplane, they are available from Skyport > 6.) I would suspect the gaskets on your fuel caps are > hardened and do not seal well. > Especially if you are burning car gas. > > Wayne Woollard ========================================================================== ==== 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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