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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. When you examine other fuel systems in aircraft the Alon fuel system is incredibly simple and efficient, when it all works. No tank switching valves, good plumbing practices, no low spots? to induce fuel starvation via trapped air. Automatic fuel balance, and Automatic temperature bleed. Problems occur when parts are added or eliminated, with little knowledge of their necessity in the system by others, and we as owners are not exactly sure just what belongs, and what doesn't! I would take the time and research the fuel system to see what is supposed to be there, and what isn't, which modifications have been done and which haven't. Lynn has a real handle on the modifications, pro and con, over the evolutionary lifespan of the Aircoupe. Wayne Woollard ----- Original Message ----- From: "R M Finch" <[EMAIL PROTECTED]> To: "'Ercoupe Technical Discussion (moderated)'" <[email protected]> Sent: Saturday, September 13, 2003 6:54 AM Subject: [COUPERS-TECH] Re: Alon Fuel Caps > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > My Alon has non-vented, clamp-on style fuel caps on the wings, and a > vented screw-on cap on the header tank. > > I've been thinking of switching to vented caps on the wings, because > often, during the large temperature swings we experience in California's > Central Valley from day to night (30-35 deg F), fuel spills from the > header tank vent and makes a mess. The wing tanks become pressurized > and push fuel into the header tank. When I release the clamps on the > wing tanks, a hiss of air can be heard and the aluminum tank oil-canning > as the pressure is released. > > Ralph Finch > [EMAIL PROTECTED] > > > From: [EMAIL PROTECTED] > > To: [EMAIL PROTECTED], [email protected] > > Reply-To: [EMAIL PROTECTED] > > Subject: Re: [COUPERS-TECH] Alon fuel venting from wing tank caps) > > > > Bob; I guess we need to know what service bulletins have been > > complied with > > on your Alon. I believe there have been at least 3 bulletins > > concerning fuel > > system modifications to the Alon. I do not have a copy of > > service bulletin # 8, > > but # 16 says that "In some instances, fuel has been observed > > flowing during > > flight from the vented fuel-filler caps. To preclude these condition, > > accomplish Instruction I and II." > > Originally, the Alon had thermos bottle style wing > > tank fuel caps. > > Apparently service bulletin # 8 put vented caps on, and then > > # 16 removed them. > > Service bulletin # 19 moved the gascolator up on the > > firewall, but I do not > > believe it made any changes to the fuel tank filler caps. > > One Alon I worked on had a problem with the fuel > > venting out of the > > wing filler caps, and I replaced the vented caps with the > > thermos style, non > > vented caps. That seems to have stopped the problem. > > The Alon has a vent in the fuselage filler cap, a vent > > out the bottom > > of the fuselage from the fuselage tank, and a fuselage tank > > drain line which > > comes out the bottom of the fuselage also. > > Does your Alon seem to have all these lines Bob? > > Lynn Nelsen > > ========================================================================== == == > 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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