In a message dated 00-05-03 03:00:07 EDT, you write: > It turned out that someone had replaced the fuel line from the gascolator, > mounted on the firewall, to the fuel injection unit with a fuel line that was > too large in diameter. This, coupled with the fact that the gascolator was > vented under the top of the cowl caused the engine to quit whenever you made > a rapid rotation on take off.
I am not familiar with this configuration. A vented gascolator may be able to introduce an air bubble into the fuel line. I am also not sure what I said that you are disagreeing with. I stand behind the following: Gravity fed (carb) systems are not subject to vapor locking. Boost pumps (or any fuel pump, for that matter) will not vapor lock as long as the feed to the pump inlet is gravity feed. The problem occurs when the pump needs to lift the fuel (not push it). The suction cannot immediately clear the vapor bubble, and in fact agrivates the problem as lower pressure causes more vapor. The Ercoupe engine driven pump is higher than the wing tanks, and therefor subject to vapor lock. The header tank provides a cushion, and the vapor lock condition will clear before the header runs dry, so should be no problem. Luscombes with fuselage tanks are subject to engine power loss on takeoff because the fuel head on climb is minimal and the fuel burn is maximal. The fuel system simply can't deliver enough fuel fast enough due to the combination of fuel line size and low pressure. This may also be an issue with the Alon, but the Luscombe tank is much further back, so there's more of a head loss. 'Course, it could be just carb ice. Small Continentals can ice up in a heart beat and lots of folks refuse to acknowledge that. John __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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